Thinker · 279 BCE–206 BCE

Chrysippus

Chrysippus systematized Stoicism across logic, physics, and ethics, providing arguments that let the school compete with Academic and Peripatetic rivals.

Intellectual setting

Leading the Stoa after Cleanthes, Chrysippus wrote extensively in the competitive Hellenistic culture of Athens; almost all of his work now survives only in quotation and report.

Key ideas

Propositional logic

Arguments can be analyzed through whole propositions and their connections, including conditionals and disjunctions, rather than only through subject-predicate terms.

Compatibilist responsibility

Events follow a causal order, yet an agent's assent and character are among the internal causes for which that agent is responsible.

Legacy

Ancient writers called him a second founder of Stoicism, and modern scholarship treats his lost logical and ethical arguments as decisive for the school’s later form.

At a glance

Dates: 279 BCE–206 BCE · approximate

Places: Soli and Athens

Connections: 4 influences

Schools: Stoicism

Selected works

Chrysippus reportedly wrote hundreds of books, but none survives complete; his positions are reconstructed from fragments and reports by later authors.

Connections

Influenced Carneades (documented influence): Diogenes Laertius 4.62 reports Carneades saying that if Chrysippus had not been, he would not have been; the Stoic system supplied the arguments he spent his career dismantling, which makes the debt adversarial rather than doctrinal.
Influenced Epictetus (documented influence): Epictetus names Chrysippus' treatises On Choice, On Impulse and On the Possible in the Discourses and reasons from them; he also treats such texts as means to living well rather than as objects of study, so the debt is selective.
Influenced Seneca (probable influence): Seneca writes as a late Stoic working within the doctrinal system Chrysippus built, and his letters argue over Chrysippean accounts of the emotions; his relation to early Stoic orthodoxy is a live scholarly question rather than a settled dependence.
Influenced by Cleanthes (documented influence): Chrysippus studied under Cleanthes and succeeded him as head of the Stoa around 230 BCE, becoming the school's foremost systematiser; because no complete work by either survives, the extent of his departures from Cleanthes is reconstructed from later reports.

Sources

Stoicism , Stanford Encyclopedia of Philosophy
A New History of Western Philosophy: Ancient Philosophy , Coverage of Chrysippus and the surrounding tradition, Oxford University Press