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Philosopher

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Zeno of Citium

c. 334–c. 262 BCE · Stoicism · Ancient

Zeno of Citium, on Cyprus, lived from about 334 to about 262 BCE. He came to Athens, studied with the Cynic Crates, and also with Academics and Megarians, then taught in the Stoa Poikile, the Painted Porch, which gave Stoicism its name. His books are lost. The Republic he wrote was notorious for proposing a city without ordinary temples, law-courts, and family conventions.

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What the doxographers preserve is the outline of a system in three parts: logic, physics, and ethics. The end is to live in agreement with nature, which the school interprets as life according to reason, and virtue is the only true good. Health, wealth, and reputation are indifferents, worth selecting but not worth calling good.

The cosmos is a rational animal shot through with fiery reason, which is why Heraclitus's fragments appealed to them. Chrysippus, the third head of the school, fixed the doctrines in hundreds of books, also lost. Roman Stoics, Seneca, Epictetus, and Marcus, are what most readers actually meet, because their pages survived. Treating a line of Marcus as 'what Zeno said' skips three centuries of argument. The one-line formula for the end is a report, not a page from a manuscript.

Zeno's books are lost. The cards are doxography: the end in Diogenes Laertius 7.87, the principles in 7.134, the smooth-flow formula in Stobaeus (SVF I 184), and a reported saying in 7.23. A sentence from the lost Republic was not invented.

Start here

Diogenes Laertius 7.1–160, especially 7.84–131 on Stoic ethics.

It is a late and messy summary, and it is still the best single map of the system Zeno started.

Quotations

“He used to say that we have two ears and one mouth, so that we might hear more and talk less.”

Zeno of Citium · Stoicism

knowledgevirtue
Questionable
Meaning & application
“Zeno of Citium says that the two principles of the universe are god and matter, god being the active principle and matter the passive.”

Zeno of Citium · Stoicism

knowledgemeaning
Questionable
Meaning & application

Key ideas

  • Agreement with nature

    The end of life is to live in agreement with nature, understood as the rational order of the cosmos.

  • Virtue is the only good

    Other so-called goods are indifferents: selectable, but not what makes a life good or bad.

  • A three-part system

    Ethics sits on logic and physics, so the later Roman exercises assume a theory most readers no longer share.

Major works

  • Republic (lost) (early 3rd century BCE)

    A notorious sketch of a Cynic-influenced city, known only from later, often hostile, reports.

  • On Life According to Nature (lost) (3rd century BCE)

    The ethical formula associated with him is preserved by doxographers, not in a book we can open.

Influences

Influenced

Common misreadings

  • 'Live according to nature' does not mean follow your impulses or move to the countryside.
  • Roman Stoic books are not transcripts of Zeno, whose own works are gone.

Topic hubs

Famous lines Zeno of Citium never said

Misattributed means the library does not treat the sentence as theirs. Questionable means there is a real doubt, which is not the same as a proof they never wrote it. Both are listed here.

  • Questionable

    “The end is to live in agreement with nature.”

    Zeno's books are lost. This is the standard doxographical formula for his ethics. Later Stoics repeat and refine it. The exact words are not from an extant work of his.

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  • Questionable

    “He used to say that we have two ears and one mouth, so that we might hear more and talk less.”

    Diogenes Laertius 7.23, in the life of Zeno of Citium, the founder of the Stoa. His books are lost. This is a reported saying, not a sentence from the Republic, the book of his that does not survive.

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  • Questionable

    “Zeno of Citium says that the two principles of the universe are god and matter, god being the active principle and matter the passive.”

    Diogenes Laertius 7.134 names Zeno of Citium for the Stoic pair of principles. The sentence is the doxographer's summary. Zeno's own treatise does not survive. It is not the ethical formula in 7.87.

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  • Questionable

    “Happiness is a smooth flow of life.”

    The Greek is eudaimonia euroia biou. Stobaeus reports it as Zeno's, and von Arnim prints it as SVF I 184. It is a doxographical formula, not a surviving sentence from Zeno's own book. It glosses the end reported by Diogenes Laertius 7.87.

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FAQ

What is the best book to start with?

Diogenes Laertius 7.1–160, especially 7.84–131 on Stoic ethics. It is a late and messy summary, and it is still the best single map of the system Zeno started.

What is the most famous quote?

This library does not measure fame. It also does not file a line for Zeno of Citium that it is willing to treat as a settled quotation.

What is the most misquoted line?

No line filed for Zeno of Citium is marked Misattributed. The nearest doubt is Questionable, which is not the same thing: “The end is to live in agreement with nature.” Zeno's books are lost. This is the standard doxographical formula for his ethics. Later Stoics repeat and refine it. The exact words are not from an extant work of his.

What is one key idea, in a sentence?

Agreement with nature: The end of life is to live in agreement with nature, understood as the rational order of the cosmos.