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{{Short description|Greek Stoic philosopher}}
{{Infobox philosopher
| name = Chrysippus of Soli
| image = Chrysippos BM 1846.jpg
| caption = Roman copy of a Hellenistic bust of<br />Chrysippus (British Museum)
| birth_date = {{circa}}&nbsp;279 BCE
| birth_place = Soli, Cilicia<br />(now Mezitli, Mersin, [[Place:Turkey|Turkey]])
| death_date = {{circa}}&nbsp;206 BC (aged 73)
| death_place = [[Place:Athens|Athens]], Greece
| death_cause = Death from laughter (uncertain)
| era = [[Philosophy:Hellenistic philosophy|Hellenistic philosophy]]
| region = [[Philosophy:Western philosophy|Western philosophy]]
| school_tradition = [[Philosophy:Stoicism|Stoicism]]
| main_interests = {{hlist |[[Logic]] |[[Physics:Physics|Physics]] |[[Philosophy:Ethics|Ethics]]}}
| notable_ideas = {{startplainlist|class=nowrap}}
* Systemization of Stoicism
* ''[[Philosophy:Pneuma (Stoic)|Pneuma]]''
* [[Philosophy:Nominalism|Nominalism]]
<!-- The following not clearly notable in article and Sharples (2014, p. 67) appears to credit Heraclitus (535–475 BCE) or other Stoics with either or both:
* [[Philosophy:Ekpyrosis|Ekpyrosis]]
* [[Philosophy:Palingenesis|Palingenesis]] 
-->
| influences = {{hlist |[[Biography:Zeno of Citium|Zeno of Citium]] |[[Biography:Cleanthes|Cleanthes]] |[[Biography:Diodorus Cronus|Diodorus Cronus]] |[[Biography:Philo the Dialectician|Philo]] |[[Biography:Aristotle|Aristotle]] |[[Biography:Plato|Plato]]}}
| influenced = Stoic school
}}

'''Chrysippus of Soli''' ({{IPAc-en|k|r|aɪ|ˈ|s|ɪ|p|ə|s|,_|k|r|ɪ|-}};<ref>[http://www.dictionary.com/browse/chrysippus "Chrysippus"]. ''Random House Webster's Unabridged Dictionary''.</ref> {{lang-grc-gre|Χρύσιππος ὁ Σολεύς}}, {{lang|grc-Latn|Chrysippos ho Soleus}}; {{nowrap|{{circa}}&nbsp;279 –}} {{nowrap|{{circa}}&nbsp;206 BC{{efn|He died according to [[Biography:Apollodorus of Athens|Apollodorus of Athens]] (ap. [[Biography:Diogenes Laërtius|Diogenes Laërtius]], vii. 184) at the age of 73 during the 143rd [[Physics:Olympiad|Olympiad]] (208–204 BC). Thus his date of birth is placed between 281 and 277. The statements in Pseudo-Lucian (''Macr.'' 20) that he died aged 81, and Valerius Maximus that he was still writing at the age of 80 (Val. Max. viii. 7) are considered less credible.<ref name="dorandi1">Cf. {{harvnb|Dorandi|1999|p=40}}</ref>}}}}) was a {{wipe|Ancient Greece}} [[Philosophy:Stoicism|Stoic]] [[Philosophy:Philosophy|philosopher]]. He was a native of Soli, Cilicia, but moved to [[Place:Athens|Athens]] as a young man, where he became a pupil of the Stoic philosopher [[Biography:Cleanthes|Cleanthes]]. When Cleanthes died, around 230 BC, Chrysippus became the third head of the Stoic school. A prolific writer, Chrysippus expanded the fundamental doctrines of Cleanthes' mentor [[Biography:Zeno of Citium|Zeno of Citium]], the founder and first head of the school, which earned him the title of the Second Founder of Stoicism.<ref>{{harvnb|Dorandi|1999|p=40}}</ref>

Chrysippus excelled in [[Logic|logic]], the theory of knowledge, [[Philosophy:Ethics|ethics]], and [[Physics:Stoic physics|physics]]. He created an original system of propositional logic in order to better understand the workings of the universe and role of humanity within it. He adhered to a fatalistic view of [[Philosophy:Destiny|fate]], but nevertheless sought a role for personal [[Philosophy:Agency|agency]] in thought and action. Ethics, he thought, depended on understanding the nature of the universe, and he taught a therapy of extirpating the [[Philosophy:Stoic passions|unruly passions]] which depress and crush the soul. He initiated the success of Stoicism as one of the most influential philosophical movements for centuries in the {{wipe|Ancient Greece}} and [[History:Ancient Rome|Roman]] world. The linguistic orientation of Chrysippus' work made it difficult for its students even within the Stoic school.<ref name="Luhtala2000">{{Harvnb|Luhtala|2000|p=194 }}</ref>

Of his several written works, none have survived except as fragments.{{efn|"The loss of so much of Chrysippus' work is the loss of philosophical work of the highest calibre..."<ref>{{Harvnb|Rist|1969|p=vii }}</ref>}} Recently, segments of some of his works were discovered among the Herculaneum papyri.{{efn|"The first of Chrysippus' partially preserved two or three works is his ''Logical Questions'', contained in PHerc. 307 ... The second work is his ''On Providence'', preserved in PHerc 1038 and 1421 ... A third work, most likely by Chrysippus is preserved in PHerc. 1020."<ref name="fitzgerald"/>}}

== Life ==
Chrysippus was the son of Apollonius of Tarsus, and he was born at Soli, Cilicia.<ref>{{Harvnb|Gould|1970|p=7}}, citing Diogenes Laërtius, vii. 179; Galen, ''Protreptic'', 7; ''de Differentia Pulsuum'', 10</ref> He was slight in stature,<ref name="laertius182">Diogenes Laërtius, vii. 182</ref> and is reputed to have trained as a long-distance runner.<ref name="laertius179">Diogenes Laërtius, vii. 179</ref> While still young, he lost his substantial inherited property when it was confiscated to the king's treasury.<ref>Diogenes Laërtius, vii. 181.</ref>{{efn|The king is not named, but [[Place:Cilicia|Cilicia]] was contested between Ptolemy II Philadelphus and Antiochus I Soter during this period.<ref>cf. {{Harvnb|Green|1993|p=639}}</ref>}} Chrysippus moved to [[Place:Athens|Athens]], where he became the disciple of [[Biography:Cleanthes|Cleanthes]], who was then the head (''scholarch'') of the Stoic school.<ref>Diogenes Laërtius, vii. 179.</ref>{{efn|The claim that he studied under Zeno is less likely because Zeno died in 262/1.<ref>cf. {{Harvnb|Dorandi|1999|p=40}}</ref>}} He is believed to have attended the courses of [[Philosophy:Arcesilaus|Arcesilaus]] and his successor [[Philosophy:Lacydes of Cyrene|Lacydes]], in the [[Philosophy:Platonic Academy|Platonic Academy]].<ref name="laertius184">Diogenes Laërtius, vii. 184</ref>

Chrysippus threw himself eagerly into the study of the Stoic system. His reputation for learning among his contemporaries was considerable.<ref name="laertius179"/> He was noted for intellectual audacity and self-confidence and his reliance on his own ability was shown, among other things, in the request he is supposed to have made to Cleanthes: "Give me the principles, and I will find the proofs myself."<ref name="laertius179"/> He succeeded Cleanthes as head of the Stoic school when Cleanthes died, in around 230 BC.

Chrysippus was a prolific writer. He is said to rarely have gone without writing 500 lines a day<ref name="laertius181">Diogenes Laërtius, vii. 181</ref> and he composed more than 705 works.<ref name="laertius180">Diogenes Laërtius, vii. 180</ref> His desire to be comprehensive meant that he would take both sides of an argument<ref name="laertius184"/> and his opponents accused him of filling his books with the quotations of others.<ref>Diogenes Laërtius, vii. 181, x. 26–27</ref> He was considered diffuse and obscure in his utterances and careless in his style, but his abilities were highly regarded, and he came to be seen as a preeminent authority for the school.<ref name="davidson614">{{Harvnb|Davidson|1908|p=614}}</ref>

[[File:Chrysippus of Soli - Delle Vite de Filosofi di Diogene Laertio 1606.png|thumb|right|Final moments in the life of Chrysippus. Engraving from 1606.]]
He died during the 143rd [[Physics:Olympiad|Olympiad]] (208–204 BC) at the age of 73.<ref name="dorandi1"/> [[Biography:Diogenes Laërtius|Diogenes Laërtius]] gives two different accounts of his death.<ref name="laertius185">Diogenes Laërtius, vii. 185</ref> In the first account, Chrysippus was seized with dizziness having drunk undiluted wine at a feast, and died soon after. In the second account, he was watching a donkey eat some [[Biology:Common fig|figs]] and cried out: "Now give the donkey a drink of pure wine to wash down the figs", whereupon he died in a fit of laughter. His nephew [[Biography:Aristocreon|Aristocreon]] erected a statue in his honour in the Kerameikos.<ref>[[Philosophy:Plutarch|Plutarch]], ''De Stoicorum Repugnantiis''; Diogenes Laërtius, vii. 183</ref> Chrysippus was succeeded as head of the Stoic school by his pupil [[Biography:Zeno of Tarsus|Zeno of Tarsus]].<ref>Eusebius, ''Praeparatio Evangelica'', 15. 18; Diogenes Laërtius, vii. 35</ref>

Of his written works, none survived except as fragments quoted in the works of later authors like [[Biography:Cicero|Cicero]], [[Biography:Seneca the Younger|Seneca]], [[Biography:Galen|Galen]], [[Philosophy:Plutarch|Plutarch]], and others. Recently, segments from ''Logical Questions'' and ''On Providence'' were discovered among the Herculaneum papyri.<ref name="fitzgerald">{{Harvnb|Fitzgerald|2004|p=11}}</ref> A third work by Chrysippus may also be among them.<ref name="fitzgerald"/>

== Study ==
Chrysippus had a long and successful career of resisting the attacks of the [[Philosophy:Platonic Academy|Academy]]<ref name="ConEWP">"Chrysippus", J. O. Urmson, [[Biography:Jonathan Rée|Jonathan Rée]], ''The Concise Encyclopedia of Western Philosophy'', 2005, pp. 73–74 of 398 pp.</ref> and hoped not simply to defend Stoicism against the assaults of the past, but also against all possible attack in the future. He took the doctrines of Zeno and Cleanthes and crystallized them into what became the definitive system of [[Philosophy:Stoicism|Stoicism]].<ref name=ConEWP/> He elaborated the [[Physics:Stoic physics|physical doctrines]] of the Stoics and their [[Philosophy:Epistemology|theory of knowledge]]<ref name="davidson614"/> and he created much of their formal logic.<ref name="barnes65">{{Harvnb|Barnes|1999|p=65}}</ref> In short, Chrysippus made the Stoic system what it was. It was said that "without Chrysippus, there would have been no Stoa".{{efn|{{lang-el|εἰ μὴ γὰρ ἦν Χρύσιππος, οὐκ ἂν ἦν στοά}}<ref>Diogenes Laërtius, vii. 183.</ref>}}

== Logic ==
Chrysippus wrote much on the subject of logic and created a system of propositional logic. [[Biography:Aristotle|Aristotle]]'s [[Philosophy:Term logic|term logic]] had been concerned with the interrelations of [[Philosophy:Syllogism#Terms in syllogism|terms]] such as "Socrates" or "man" ("all men are mortal, Socrates is a man, so Socrates is mortal"). Stoic logic, on the other hand, was concerned with the interrelations of [[Proposition|proposition]]s such as "it is day" ("if it is day, it is light: but it is day: so it is light").<ref name="sharples24">{{Harvnb|Sharples|2014|p=24}}</ref><ref name="Mueller1978">Ian Mueller  (1978)  An Introduction to Stoic Logic {{Harvnb|Rist|1978|pp=2–13}}</ref> Though the earlier [[Philosophy:Megarian school|Megarian dialecticians]] –&nbsp;[[Biography:Diodorus Cronus|Diodorus Cronus]] and [[Biography:Philo the Dialectician|Philo]]&nbsp;– had worked in this field and the pupils of [[Biography:Aristotle|Aristotle]] –&nbsp;[[Biography:Theophrastus|Theophrastus]] and [[Biography:Eudemus of Rhodes|Eudemus]]&nbsp;– had investigated [[Hypothetical syllogism|hypothetical syllogism]]s,<ref name="johansen466">{{harvnb|Johansen|Rosenmeier|1998|p=466}}</ref> it was Chrysippus who developed these principles into a coherent system of propositional logic.<ref name="johansen466"/><ref name="sharples2425">{{harvnb|Sharples|2014|pp=24–25}}</ref>

===Propositions===
Chrysippus defined a proposition as "that which is capable of being denied or affirmed as it is in itself" and gave examples of propositions such as "it is day" and "Dion is walking."<ref>Diogenes Laërtius, vii. 65</ref><ref>{{harvnb|Gould|1970|pp=69–70}}</ref> He distinguished between simple and non-simple propositions, which in modern terminology are known as [[Philosophy:Atomic sentence|atomic]] and molecular propositions.<ref name="johansen466"/> A simple proposition is an elementary statement such as "it is day."<ref name="gould71">{{harvnb|Gould|1970|p=71}}</ref> Simple propositions are linked together to form non-simple propositions by the use of [[Logical connective|logical connective]]s. Chrysippus enumerated five kinds of molecular propositions according to the connective used:<ref name="gould71"/>

{| class="wikitable" style="margin:1.0em auto;border:1px;background:white;"
!colspan=2 style="background:white;text-align:center;"| Logical connectives
|- style="background:white"
! Type                !! Example
|-
| if            || '''if''' it is day, it is light
|-
| and           || it is day '''and''' it is light
|-
| either ... or || '''either''' it is day '''or''' it is night
|-
| because       || '''because''' it is day, it is light
|-
| | more/less likely ... than || '''more likely''' it is day '''than''' it is night
|}

Thus several types of molecular propositions, familiar to modern logic, were listed by Chrysippus, including the [[Logical conjunction|conjunction]], the [[Logical disjunction|disjunction]], and the [[Material conditional|conditional]],<ref name="johansen467">{{harvnb|Johansen|Rosenmeier|1998|p=467}}</ref> and Chrysippus studied their criteria of [[Logical truth|truth]] closely.<ref name="johansen467"/>

===Conditional propositions===
The first logicians to debate conditional statements were [[Biography:Diodorus Cronus|Diodorus Cronus]] and his pupil [[Biography:Philo the Dialectician|Philo]]. Writing five-hundred years later, [[Biography:Sextus Empiricus|Sextus Empiricus]] refers to a debate between Diodorus and Philo.<ref name="sextus1">[[Biography:Sextus Empiricus|Sextus Empiricus]], ''Pyr. Hyp.'' ii. 110–112; ''Adv. Math.'' viii. 112–117</ref> Philo regarded all conditionals as true except those which with a correct [[Philosophy:Antecedent (logic)|antecedent]] had an incorrect [[Consequent|consequent]], and this meant a proposition such as "if it is day, then I am talking," is true unless it is day and I fall silent.<ref name="sextus2">Sextus Empiricus, ''Pyr. Hyp.'', ii. 110–112</ref> But Diodorus argued that a true conditional is one in which the antecedent clause could never lead to an untrue conclusion{{snd}}thus, because the proposition "if it is day, then I am talking" can be false, it is invalid.<ref name="sextus1"/> However, [[Paradoxes of material implication|paradoxical propositions]] were still possible such as "if atomic elements of things do not exist, atomic elements exists."<ref name="sextus2"/> Chrysippus adopted a much stricter view regarding conditional propositions, which made such paradoxes impossible:{{efn|When Sextus Empiricus reports the different criteria offered by ancient philosophers for the truth of conditional propositions, he does not mention Chrysippus by name, but modern scholars believe that Chrysippus authored, or, at least, held this view.<ref>See {{Harvnb|Gould|1970|pp=72–82}}</ref>}} to him, a conditional is true if denial of the consequent is logically incompatible with the antecedent.<ref name="johansen468">{{Harvnb|Johansen|Rosenmeier|1998|p=468}}</ref> This corresponds to the modern-day [[Strict conditional|strict conditional]].<ref name="johansen468"/>

===Syllogistic===
Chrysippus developed a syllogistic or system of deduction in which he made use of five types of basic arguments or argument forms called indemonstrable syllogisms,<ref>Diogenes Laërtius, vii. 79</ref> which played the role of axioms, and four [[Rule of inference|inference rules]], called ''themata'' by means of which complex syllogisms could be reduced to these axioms.<ref name="Kneale">{{Harvnb|Kneale|Kneale|1962|pages=158–174}}</ref><ref>[[Biography:Susanne Bobzien|Susanne Bobzien]], Stoic Syllogistic, ''Oxford Studies in Ancient Philosophy'' 14, 1996, pp. 133–192</ref> The forms of the five indemonstrables were:<ref>Diogenes Laertius, vii. 80-81; Sextus Empiricus, ''Hyp. Pyr.'' ii. 156–159; cf. ''Adv. Math.'' viii. 223ff.</ref><ref name="Mates">{{Harvnb|Mates|1953|pages=67–73 }}</ref>

{| class="wikitable" style="margin:1.0em auto;"
!colspan=2| Name{{efn|These [[Social:Latin|Latin]] names, unknown to Chrysippus, date from the Middle Ages.<ref>{{harvnb|Sharples|2014|p=24}}</ref>}}
! Description
! Example
|-
|colspan=2| [[Modus ponens]]
|style="white-space:nowrap;"| If A, then B.&nbsp; A.&nbsp; Therefore, B.
| ''If it is day, it is light. It is day. Therefore, it is light.''
|-
|colspan=2| [[Modus tollens]]
|style="white-space:nowrap;"| If A, then B.&nbsp; Not B.&nbsp; Therefore, not A.
| ''If it is day, it is light. It is not light. Therefore, it is not day.''
|-
|rowspan=2| [[Modus ponendo tollens]]&nbsp;
|style="width:1.5em;text-align:center;"| i
|style="white-space:nowrap;"| Not both A and B.&nbsp; A.&nbsp; Therefore, not B.&nbsp;
| ''It is not both day and night. It is day. Therefore, it is not night.''&nbsp;
|-
|style="text-align:center;"| ii
|style="white-space:nowrap;"| Either A or B.&nbsp; A.&nbsp; Therefore, not B.
| ''It is either day or night. It is day. Therefore, it is not night.''
|-
|colspan=2| Modus tollendo ponens
|style="white-space:nowrap;"| Either A or B.&nbsp; Not A.&nbsp; Therefore, B.
| ''It is either day or night. It is not day. Therefore, it is night.''
|}

Of the four inference rules (themata, θέματα),<ref name="L&S">{{Harvnb|Long |Sedley|1987|}}, §36 HIJ</ref> only two survived. One, the so-called first ''thema'', was a rule of antilogism. The other, the third ''thema'', was a cut rule by which chain syllogisms could be reduced to simple syllogisms.<ref name="Kneale2">{{Harvnb|Kneale|Kneale|1962|p=169}}</ref><ref>{{cite SEP |url-id=logic-ancient/#StoSyl |title=Ancient Logic: Stoic Syllogistic |last=Bobzien |first=Susanne}}</ref>  The purpose of Stoic syllogistic was not merely to create a formal system. It was also understood as the study of the operations of reason, the divine reason (''[[Philosophy:Logos|logos]]'') which governs the [[Astronomy:Universe|universe]], of which human beings are a part.<ref name="sharples26">{{harvnb|Sharples|2014|p=26}}</ref> The goal was to find valid rules of inference and forms of proof to help people find their way in life.<ref name="johansen466"/>
[[File:New Guinea Singing Dog sniffing the ground.jpg|thumb|130px|Chrysippus argued dogs reason.]]

According to Sextus Empiricus, Chrysippus held that dogs use disjunctive syllogism, such as when using scent to pick which path to run down. This was in contrast to a tradition since Aristotle, who saw reasoning (and reasoning deductively) as man's defining aspect.<ref>Sextus Empiricus, Outlines of Pyrrhonism, I.69</ref>

===Other logical work===
Chrysippus analyzed speech and the handling of names and terms.<ref name="davidson614"/> He also devoted much effort in refuting fallacies and paradoxes.<ref name="davidson614"/> According to Diogenes Laërtius, Chrysippus wrote twelve works in 23 books on the [[Philosophy:Liar paradox|Liar paradox]]; seven works in 17 books on amphiboly; and another nine works in 26 books on other conundrums.<ref name="barnes71">{{Harvnb|Barnes|1999|p=71}}</ref> In all, 28 works or 66 books were given over to puzzles or paradoxes.<ref name="barnes71"/>
Chrysippus is the first Stoic for whom the third of the four [[Philosophy:Stoic categories|Stoic categories]], i.e. the category ''somehow disposed'' is attested.<ref>Stephen Menn, "The Stoic Theory of Categories", in ''Oxford Studies in Ancient Philosophy'': Volume XVII: 1999, 215–247.</ref> In the surviving evidence, Chrysippus frequently makes use of the categories of ''substance'' and ''quality'', but makes little use of the other two Stoic categories (''somehow disposed'' and ''somehow disposed in relation to something'').<ref name="gould107">{{Harvnb|Gould|1970|p=107}}</ref> It is not clear whether the categories had any special significance for Chrysippus, and a clear doctrine of categories may be the work of later Stoics.<ref name="gould107"/>

===Later reception===
Chrysippus came to be renowned as one of the foremost logicians of ancient Greece. When [[Biography:Clement of Alexandria|Clement of Alexandria]] wanted to mention one who was master among logicians, as [[Biography:Homer|Homer]] was master among poets, it was Chrysippus, not Aristotle, he chose.<ref>[[Biography:Clement of Alexandria|Clement of Alexandria]], ''Stromata'', vii. 16</ref> [[Biography:Diogenes Laërtius|Diogenes Laërtius]] wrote: "If the gods use [[Philosophy:Dialectic|dialectic]], they would use none other than that of Chrysippus."<ref>Diogenes Laërtius, vii. 180.</ref> The logical work by Chrysippus came to be neglected and forgotten. Aristotle's logic prevailed, partly because it was seen as more practical, and partly because it was taken up by the Neoplatonists.<ref name="sharples26"/> As recently as the 19th century, Stoic logic was treated with contempt, a barren formulaic system, which was merely clothing the logic of Aristotle with new terminology.<ref name="otoole403">{{Harvnb|O'Toole|Jennings|2004|p=403}}</ref> It was not until the 20th century, with the advances in logic, and the modern [[Propositional calculus|propositional calculus]], that it became clear that Stoic logic constituted a significant achievement.<ref name="johansen466"/>

== Epistemology ==
For the Stoics, truth is distinguished from error by the sage who possesses right reason.<ref name="hicks70">{{Harvnb|Hicks|1910|p=70}}</ref> Chrysippus's theory of knowledge was [[Philosophy:Empiricism|empirical]].<ref name="gould90">{{Harvnb|Gould|1970|p=90}}</ref> The [[Philosophy:Sense|sense]]s transmit messages from the external world, and their reports are controlled not by referring them to innate ideas, but by comparing them to previous reports stored in the mind.<ref name="gould90"/> Zeno had defined impressions of sense as "an impression in the soul"<ref name="stock22">{{Harvnb|Stock|1908|p=22}}</ref> and this was interpreted literally by Cleanthes, who compared the impression on the soul to the impression made by a [[Seal (emblem)|seal]] on wax.<ref name="zeller77">{{Harvnb|Zeller|1880|p=77}}</ref> Chrysippus preferred to regard it as an alteration or change in the soul;<ref name="stock22"/> that is, the soul receives a modification from every external object that acts upon it, just as the air receives countless strokes when many people are speaking at once.<ref name="stock22"/>

In the receipt of an impression, the soul is purely passive and the impression reveals not only its own existence, but that also of its cause{{snd}}just as light displays itself and the elements that are in it.<ref name="stock22"/> The power to name the object resides in the understanding. First must come the impression, and the understanding{{snd}}having the power of utterance{{snd}}expresses in speech the affection it receives from the object.<ref name="stock23">{{Harvnb|Stock|1908|p=23}}</ref> True presentations are distinguished from those that are false by the use of memory, classification and comparison.<ref name="gould90"/> If the sense organ and the mind are healthy{{snd}}and provided that an external object can be really seen or heard{{snd}}the presentation, due to its clearness and distinctness, has the power to extort the assent that always lies in our power, to give or to withhold.<ref>{{Harvnb|Hicks|1911|p=946}}</ref> In a context in which people are understood to be rational beings, reason is developed out of these notions.<ref name="hicks66">{{Harvnb|Hicks|1910|p=66}}</ref>

== Physics ==
[[File:Chrysippus of Soli.jpg|right|thumb|A partial marble bust of Chrysippus that is a Roman copy of a Hellenistic original (Louvre Museum).]]
Chrysippus insisted on the organic unity of the [[Astronomy:Universe|universe]], as well as the correlation and mutual interdependence of all of its parts.<ref>[[Biography:Cicero|Cicero]], ''De Natura Deorum'', ii, 19</ref> He said, the universe is "the soul and guide of itself."<ref>Plutarch, [https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A2008.01.0389%3Asection%3D41 ''De Stoicorum Repugnantiis'', 41.]</ref> Following Zeno, Chrysippus determined fiery breath or [[Philosophy:Aether (classical element)|aether]] to be the primitive substance of the universe.<ref>{{Harvnb|Hicks|1911|p=944}}</ref> Objects are made up of inert formless matter and an informing soul, "''[[Philosophy:Pneuma (Stoic)|pneuma]]''", provides form to the undifferentiated matter.<ref name="otoole431">{{Harvnb|O'Toole|Jennings|2004|p=431}}</ref> The ''pneuma'' pervades all of substance and maintains the unity of the universe and constitutes the [[Philosophy:Soul|soul]] of the human being.<ref name="otoole431"/>

The classical elements change into one another by a process of [[Physics:Condensation|condensation]] and [[Physics:Rarefaction|rarefaction]].<ref name="stock79">{{Harvnb|Stock|1908|p=79}}</ref> [[Unsolved:Fire (classical element)|Fire]] first becomes solidified into [[Physics:Air (classical element)|air]]; then air into [[Chemistry:Water (classical element)|water]]; and lastly, water into [[Unsolved:Earth (classical element)|earth]]. The process of dissolution takes place in the reverse order: earth being rarefied into water, water into air and air into fire.<ref name="stock79"/>

The human soul was divided by Chrysippus into eight faculties: the five senses, the power of [[Biology:Reproduction|reproduction]], the power of speech, and the "ruling part" that is located in the chest rather than the head.<ref name="sharples67">{{Harvnb|Sharples|2014|p=67}}</ref> Individual souls are perishable; but, according to the view originated by Chrysippus, the souls of wise people survive longer after their death.<ref name="sharples67"/> No individual soul can, however, survive beyond the [[Philosophy:Ekpyrosis|periodic conflagration]], when the universe is [[Philosophy:Palingenesis|renewed]].<ref name="sharples67"/><!--It is not clear on page 67 whether this last idea originated with Chrysippus or Heraclitus or...?-->

There were no universals or abstract objects for Chrysippus, making him a kind of nominalist.{{efn|"[Stoics] have often been presented as the first nominalists, rejecting the existence of universal concepts altogether. ... For Chrysippus there are no universal entities, whether they be conceived as substantial Platonic Forms or in some other manner."<ref>John Sellars, ''Stoicism'', Routledge, 2014, pp. 84–85</ref><ref>{{Cite web|url=https://iep.utm.edu/chrysippus/|title=Chrysippus &#124; Internet Encyclopedia of Philosophy}}</ref>}}

===Fate===
For Chrysippus, all things happen according to [[Philosophy:Destiny|fate]]: what seems to be accidental has always some hidden cause.<ref name="zeller178">{{Harvnb|Zeller|1880|p=178}}</ref> The unity of the world consists in the chain-like dependence of cause upon cause.<ref name="zeller176">{{Harvnb|Zeller|1880|p=176}}</ref> Nothing can take place without a sufficient cause.<ref name="zeller175">{{Harvnb|Zeller|1880|p=175}}</ref> According to Chrysippus, every proposition is either true or false, and this must apply to future events as well:<ref name="zeller174">{{Harvnb|Zeller|1880|p=174}}</ref>
<blockquote>If any motion exists without a cause, then not every proposition will be either true or false. For that which has not efficient causes is neither true nor false. But every proposition is either true or false. Therefore, there is no motion without a cause. And if this is so, then all effects owe their existence to prior causes. And if this is so, all things happen by fate. It follows therefore that whatever happens, happens by fate.<ref>Cicero, ''On Fate'', 20–21</ref></blockquote>
The Stoic view of fate is entirely based on a view of the universe as a whole. Individual things and persons only come into consideration as dependent parts of this whole.<ref name="zeller177">{{Harvnb|Zeller|1880|p=177}}</ref> Everything is, in every respect, determined by this relation, and is consequently subject to the general order of the world.<ref name="zeller176"/>

If his opponents objected that, if everything is determined by destiny, there is no individual responsibility, since what has been once foreordained must happen, come what may, Chrysippus replied that there is a distinction to be made between simple and complex predestination.<ref name="zeller181">{{Harvnb|Zeller|1880|p=181}}</ref> Becoming ill may be fated whatever happens but, if a person's recovery is linked to consulting a doctor, then consulting the doctor is fated to occur together with that person's recovery, and this becomes a complex fact.<ref name="kenny195">{{Harvnb|Kenny|2006|p=195}} referencing [[Biography:Cicero|Cicero]], ''On Fate'', 28–29</ref> All human actions{{snd}}in fact, our destiny{{snd}}are decided by our relation to things,<ref name="zeller182">{{Harvnb|Zeller|1880|p=182}}</ref> or as Chrysippus put it, events are "co-fated" to occur:<ref name="kenny195"/>
<blockquote>The non-destruction of one's coat, he says, is not fated simply, but co-fated with its being taken care of, and someone's being saved from his enemies is co-fated with his fleeing those enemies; and having children is co-fated with being willing to lie with a woman. ... For many things cannot occur without our being willing and indeed contributing a most strenuous eagerness and zeal for these things, since, he says, it was fated for these things to occur in conjunction with this personal effort. ... But it will be in our power, he says, with what is in our power being included in fate.<ref>Diogenianus in Eusebius, ''Praeparatio evangelica'', vi. 8, quoted in {{harvnb|Inwood|Gerson|1997|p=190}}</ref></blockquote>
Thus our actions are predetermined, and are causally related to the overarching network of fate, but nevertheless the moral responsibility of how we respond to impressions remains our own.<ref>{{Harvnb|Brunschwig|Sedley|2003|p=172}}</ref> The one all-determining power is active everywhere, working in each particular being according to its nature, whether in rational or irrational creatures or in inorganic objects.<ref name="zeller179">{{Harvnb|Zeller|1880|p=179}}</ref> Every action is brought about by the co-operation of causes depending on the nature of things and the character of the agent.<ref name="zeller179"/> Our actions would only be involuntary if they were produced by external causes alone, without any co-operation, on the part of our wills, with external causes.<ref name="zeller179"/> Virtue and vice are set down as things in our power, for which, consequently, we are responsible.<ref name="zeller180">{{Harvnb|Zeller|1880|p=180}}</ref> Moral responsibility depends only on freedom of the will, and what emanates from our will is our own, no matter whether it is possible for us to act differently or not.<ref name="zeller180"/> This rather subtle position which attempts to reconcile determinism with human responsibility is known as soft-determinism, or [[Philosophy:Compatibilism|compatibilism]].<ref>{{Harvnb|Gould|1970|p=152, note 3}}</ref>

===Divination===
[[File:Kleromanteia.jpg|right|thumb|Cleromancy in ancient Greece. Chrysippus accepted divination as part of the causal chain of fate.]]
Chrysippus also argued for the existence of fate based on divination, which he thought there was good evidence for.<ref name="gould144-5">{{Harvnb|Gould|1970|pp=144–145}}</ref> It would not be possible for diviners to predict the future if the future itself was accidental.<ref name="zeller175"/> Omens and portents, he believed, are the natural symptoms of certain occurrences.<ref name="hicks947">{{Harvnb|Hicks|1911|p=947}}</ref> There must be countless indications of the course of providence, for the most part unobserved, the meaning of only a few having become known to humanity.<ref name="hicks947"/> To those who argued that divination was superfluous as all events are foreordained, he replied that both divination and our behaviour under the warnings which it affords are included in the chain of causation.<ref name="hicks947"/>

===God===
The Stoics believed that the universe is [[Religion:God|God]], and Chrysippus affirmed that "the universe itself is God and the universal outpouring of its soul."<ref name="cicerodenati15">Cicero, ''De Natura Deorum'', i. 15</ref> It is the guiding principle of the universe, "operating in mind and reason, together with the common nature of things and the totality which embraces all existence."<ref name="cicerodenati15"/> Based on these beliefs, physicist and philosopher [[Biography:Max Bernhard Weinstein|Max Bernhard Weinstein]] identified Chrysippus as a Pandeist.{{efn|"Dieser Pandeismus, der von Chrysippos (aus Soloi 280–208 v. Chr.) herrühren soll, ist schon eine Verbindung mit dem Emanismus; Gott ist die Welt, insofern als diese aus seiner Substanz durch Verdichtung und Abkühlung entstanden ist und entsteht, und er sich strahlengleich mit seiner Substanz durch sie noch verbreitet."<ref>Max Bernhard Weinsten, ''Welt- und Lebensanschauungen, Hervorgegangen aus Religion, Philosophie und Naturerkenntnis'' ("World and Life Views, Emerging From Religion, Philosophy and Perception of Nature") (1910), p. 233</ref>}}

Chrysippus sought to prove the [[Philosophy:Existence of God|existence of God]], making use of a [[Astronomy:Teleological argument|teleological argument]]:
<blockquote>If there is anything that humanity cannot produce, the being who produces it is better than humanity. But humanity cannot produce the things that are in the universe{{snd}}the heavenly bodies, etc. The being, therefore, who produces them is superior to humanity. But who is there that is superior to humanity, except God? Therefore, God exists.<ref>Cicero, ''De Natura Deorum'', iii. 10. Cf. ii. 6 for the fuller version of this argument</ref></blockquote>
Chrysippus spoke of God and gods interchangeably. He interpreted the gods of traditional Greek religion by viewing them as different aspects of the one reality. [[Biography:Cicero|Cicero]] tells us that "he further maintained that aether is that which people call [[Religion:Zeus|Zeus]], and that the air which permeates the seas is [[Religion:Poseidon|Poseidon]], and that the earth is what is known by the name of [[Religion:Demeter|Demeter]], and he treated in similar style the names of the other gods."<ref name="cicerodenati15"/> In addition, the universe exists for the benefit of the universal god:
<blockquote>We should infer in the case of a beautiful dwelling-place that it was built for its owners and not for mice; we ought, therefore, in the same way to regard the universe as the dwelling-place of the gods.<ref name="cicerodenatiii10">Cicero, ''De Natura Deorum'', iii. 10</ref></blockquote>

===Theodicy===
In response to the question of how [[Philosophy:Evil|evil]] could exist in a good universe, Chrysippus replied "evil cannot be removed, nor is it well that it should be removed."<ref>Plutarch, ''De Stoicorum Repugnantiis'', 1051 B</ref> Firstly, he argued, following [[Biography:Plato|Plato]], that it was impossible for good to exist without evil, for justice could not be known without injustice, courage without cowardice, temperance without intemperance or wisdom without foolishness.<ref name="gelliusvii1">Aulus Gellius, vii. 1</ref> Secondly, apparent evils exist as a consequent of nature's goodness, thus it was necessary for the human skull to be made from small and thin bones for reasons of utility, but this superior utility meant that the skull is vulnerable to blows.<ref name="gelliusvii1"/> Thirdly, evils are distributed according to the rational will of Zeus, either to punish the wicked or because they are important to the world-order as a whole.<ref>Plutarch, ''De Stoicorum Repugnantiis'', 1050 E; ''De Communibus Notitiis'', 1065 B</ref> Thus evil is good under disguise, and is ultimately conducive to the best. Chrysippus compared evil to the coarse jest in the comedy; for, just as the jest, though offensive in itself, improves the piece as a whole, "so too you may criticize evil regarded by itself, yet allow that, taken with all else, it has its use."<ref>Plutarch, ''De Communibus Notitiis'', 1065 D</ref>

== Mathematics ==
[[File:Kegelstumpf.png|thumb|right|The puzzle of Democritus. If a cone is sliced horizontally, are the surfaces produced equal or unequal?]]

Chrysippus regarded [[Philosophy:Physical body|bodies]], surfaces, [[Line (geometry)|lines]], places, the [[Physics:Vacuum|void]] and [[Time|time]] as all being [[Physics:Infinite divisibility|infinitely divisible]].<ref name="gould116">{{Harvnb|Gould|1970|p=116}}</ref> He determined one of the principal features of the [[Infinite set|infinite set]]: since a man and a finger have an [[Infinity|infinite]] number of parts as do the universe and a man, it cannot be said that a man has more parts than his finger, nor that the universe has more parts than a man.<ref name="gould117">{{Harvnb|Gould|1970|p=117}}</ref>

Chrysippus also responded to a problem first posed by [[Biography:Democritus|Democritus]].<ref>Plutarch, ''De Communibus Notitiis'', 1079F</ref> If a cone is divided by a [[Plane (geometry)|plane]] parallel to its base, are the surfaces of the segments equal or unequal? If they are equal, then the cone becomes a cylinder; if they are unequal, then the surface of the cone must be [[Step function|stepped]].<ref name="gould117"/> The reply of Chrysippus was that the surfaces are both equal and unequal.<ref name="gould118">{{Harvnb|Gould|1970|p=118}}</ref> Chrysippus was, in effect, negating the [[Law of excluded middle|law of excluded middle]] with respect to the equal and unequal, and thus he may have anticipated an important principle of modern infinitesimal calculus, namely, the [[Limit (mathematics)|limit]] and the process of [[Convergent series|convergence towards a limit]].<ref name="gould118"/>

Chrysippus was notable for claiming that "one" is a [[Number|number]]. One was not always considered a number by the ancient Greeks since they viewed one as that by which things are measured. [[Biography:Aristotle|Aristotle]] in his ''Metaphysics'' wrote, "... a measure is not the things measured, but the measure or the One is the beginning of number."<ref name="heath69">{{Harvnb|Heath|1921|p=69}}</ref> Chrysippus asserted that one had "magnitude one" ({{lang-el|πλῆθος ἕν}}),<ref>[[Biography:Iamblichus|Iamblichus]], ''in Nicom.'', ii. 8f; [[Biography:Syrianus|Syrianus]], ''in Arist. Metaph.'', Kroll 140. 9f.</ref> although this was not generally accepted by the Greeks, and [[Biography:Iamblichus|Iamblichus]] wrote that "magnitude one" was a contradiction in terms.<ref name="heath69"/>

== Ethics ==
[[File:Medeia child Louvre K300.jpg|right|thumb|Greek [[Social:Amphora|amphora]] depicting Euripides' ''Medea''. Chrysippus regarded Medea as a prime example of how bad judgments could give rise to irrational passions.<ref>Galen, ''On The Doctrines of Hippocrates and Plato'', iii.3.13–22, iv.2.27, iv.6.19–27.</ref>{{efn|See also Epictetus, ''Discourses'', i.28.6–10; ii.17.19–23, for an example of this play being discussed in the setting of a Stoic school.}}]]

Chrysippus taught that [[Philosophy:Ethics|ethics]] depended on physics. In his ''Physical Theses'', he stated: "for there is no other or more appropriate way of approaching the subject of good and evil on the virtues or happiness than from the nature of all things and the administration of the universe."<ref name="stock13">{{Harvnb|Stock|1908|p=13}}</ref> The goal of life, said Chrysippus, is to live in accordance with one's experience of the actual course of nature.<ref>{{Harvnb|Gould|1970|p=163}}</ref> A person's individual nature is part of the nature of the whole universe,<ref name="laertius87">Diogenes Laërtius, vii. 87</ref> and thus life should be lived in accordance with one's own human nature as well as that of the universe.<ref name="laertius88">Diogenes Laërtius, vii. 88</ref> Human nature is ethical, and humanity is akin to the Divine, emanating from the primal fire or aether, which, though material, is the embodiment of reason; and people should conduct themselves accordingly.<ref name="davidson615">{{Harvnb|Davidson|1908|p=615}}</ref> People have freedom, and this freedom consists in emancipation from irrational desires (lust, riches, position in life, domination, etc.) and in subjecting the will to reason.<ref name="davidson615"/> Chrysippus laid the greatest stress on the worth and dignity of the individual, and on the power of will.<ref name="davidson615"/>

The Stoics admitted between the good and the bad a third class of things{{snd}}the indifferent (''[[Philosophy:Adiaphora|adiaphora]]'').<ref name="kenny282">{{Harvnb|Kenny|2006|pp=282–283}}</ref> Of things morally indifferent, the best includes health, and riches, and honour, and the worst includes sickness and poverty.<ref name="zeller284">{{Harvnb|Zeller|1880|p=284}}</ref> Chrysippus accepted that it was normal in ordinary usage to refer to the preferred indifferent things as "good",<ref name="kenny282"/> but the wise person, said Chrysippus, uses such things without requiring them.<ref name="zeller284"/> Practice and habit are necessary to render virtue perfect in the individual{{snd}}in other words, there is such a thing as moral progress, and character has to be built up.<ref name="davidson615"/>

===''On Passions''===
{{Main|Philosophy:On Passions}}
The Stoics sought to be free of the [[Philosophy:Stoic passions|unruly emotions]], which they regarded as being contrary to nature. The passions or emotions (''pathe'') are the disturbing element in right judgment.<ref name="davidson615"/> Chrysippus wrote a whole book, ''On Passions'' ({{lang-el|Περὶ παθῶν}}), concerning the therapy of the emotions.<ref name="gould186">{{Harvnb|Gould|1970|p=186}}</ref> The passions are like diseases which depress and crush the soul, thus he sought to eradicate them (''[[Philosophy:Apatheia|apatheia]]'').<ref name="gould186"/> Wrong judgements turn into passions when they gather an impetus of their own, just as, when one has started running, it is difficult to stop.<ref name="sharples68">{{Harvnb|Sharples|2014|p=68}}</ref> One cannot hope to eradicate the passions when one is in the heat of love or anger: this can only be done when one is calm.<ref name="gould187">{{Harvnb|Gould|1970|p=187}}</ref> Therefore, one should prepare in advance, and deal with the passions in the mind as if they were present.<ref name="gould188">{{Harvnb|Gould|1970|p=188}}</ref> By applying reason to passions such as greed, pride, or lust, one can understand the harm which they cause.<ref name="gould188"/>

== See also ==
* [[Philosophy:Apocatastasis#Stoicism|Apocatastasis]]
* Deixis
* [[Philosophy:History of logic|History of logic]]
* [[Philosophy:Lazy argument|Lazy argument]]
* List of unusual deaths

{{clear}}

==Notes==
{{Refbegin}}

{{notelist}}

== References ==
{{Reflist}}

== Works cited==
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* {{Citation |last1=Brunschwig |first1=Jacques |last2=Sedley |first2=David |year=2003 |contribution=Hellenistic philosophy |editor-last=Sedley |editor-first=David |title=The Cambridge Companion to Greek and Roman Philosophy |publisher=Cambridge University Press |isbn=0521775035}}
* {{Citation |last=Davidson |first=William Leslie |year=1908 |contribution=Chrysippus |editor-last=Hastings |editor-first=James |title=Encyclopaedia of Religion and Ethics |volume=3 |url=https://archive.org/details/encyclopaediaofr03hastuoft |publisher=T. & T. Clark }}
* {{Citation |last=Dorandi |first=Tiziano |year=1999 |contribution=Chronology |editor-last=Algra |editor-first=Keimpe |editor2-last=Barnes |editor2-first=Jonathan |editor3-last=Mansfeld |editor3-link=Jaap Mansfeld|editor3-first=Jaap |editor4-last=Schofield |editor4-first=Malcolm |title=The Cambridge History of Hellenistic Philosophy |publisher=Cambridge University Press |isbn=0521616700}}
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== Further reading ==
* {{Citation |last=Bobzien |first=Susanne |year=1998 |title=Determinism and Freedom in Stoic Philosophy |publisher=Oxford University Press |isbn=0199247676}}
* Bobzien, Susanne (1999), ''Chrysippus' Theory of Causes''. In K. Ierodiakonou (ed.), ''Topics in Stoic Philosophy'', Oxford: OUP, 196–242. {{ISBN|019924880X}}
* Bréhier, Émile, (1951), ''Chrysippe et l'ancien stoicisme''. Paris. {{ISBN|2903925062}}
* Dufour, Richard (2004), ''Chrysippe. Oeuvre philosophique''. Textes traduits et commentés par Richard Dufour, Paris: Les Belles Lettres, 2 volumes (logic and physics), {{ISBN|2251742034}}
* Hahm, D. E. ''Chrysippus' solution to the Democritean dilemma of the cone'', Isis 63 (217) (1972), 205–220.
* {{cite book |last1=Holiday |first1=Ryan |last2=Hanselman |first2=Stephen |title=Lives of the Stoics |date=2020 |publisher=Portfolio/Penguin |location=New York |isbn=978-0525541875 |pages=38–49 |chapter=Chrysippus the Fighter}}
* Ide, H. A. ''Chrysippus's response to Diodorus's Master Argument'', History and Philosophy Logic 13 (2) (1992), 133–148.
* Tieleman, Teun L. (1996) ''Galen and Chrysippus on the Soul: Argument and Refutation in the "De Placitis" Books II–III''. Philosophia Antiqua. Brill. {{ISBN|9004105204}}
* Tieleman, Teun L. (2003) ''Chrysippus' "on Affections": Reconstruction and Interpretation''. Philosophia Antiqua. Brill. {{ISBN|9004129987}}

== External links ==
* {{cite IEP |url-id=chrysipp |title=Chrysippus |last=Kirby |first=Jeremy}}
* {{MacTutor Biography|id=Chrysippus}}
* [http://www.historyoflogic.com/biblio/stoic-logicians-biblio.htm Early Stoic Logic: Zeno of Citium, Cleanthes of Assos, Chrysippus of Soli] an annotated bibliography on the logic of Chrysippus
{{s-start}}
{{s-bef|before=[[Biography:Cleanthes|Cleanthes]]}}
{{s-ttl|title=Leader of the Stoic school
       |years=230–206 BC}}
{{s-aft|after=[[Biography:Zeno of Tarsus|Zeno of Tarsus]]}}
{{s-end}}
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