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Ideas of Zeno (Citium), by Text

[Greek, 334 - 262 BCE, Born at Citium, Cyprus. Taught by Polemo. Dissatisfied with other Athenian schools, founded the Stoics, meeting in the Stoa Poikile.]

294BCE fragments/reports
p.8 Philosophy has three parts, studying nature, character, and rational discourse [Diog. Laertius]
p.40 A grasp by the senses is true, because it leaves nothing out, and so nature endorses it [Cicero]
p.40 If a grasped perception cannot be shaken by argument, it is 'knowledge' [Cicero]
p.42 A wise man's chief strength is not being tricked; nothing is worse than error, frivolity or rashness [Cicero]
p.55 The cosmos and heavens are the substance of god [Diog. Laertius]
p.62 Rational is better than non-rational; the cosmos is supreme, so it is rational
p.63 Since the cosmos produces what is alive and rational, it too must be alive and rational
p.81 Zeno achieved the statement of the problems of infinitesimals, infinity and continuity [Russell]
p.86 A body is required for anything to have causal relations [Cicero]
p.88 There is no void in the cosmos, but indefinite void outside it [Ps-Plutarch]
p.113 Zeno said live in agreement with nature, which accords with virtue [Diog. Laertius]
p.113 One of Zeno's books was 'That Which is Appropriate' [Long]
p.124 Whatever participates in substance exists [Stobaeus]
p.126 Perception an open hand, a fist is 'grasping', and holding that fist is knowledge [Long]
p.132 The goal is to 'live in agreement', according to one rational consistent principle [Stobaeus]
p.132 Things are more perfect if they have reason; nothing is more perfect than the universe, so it must have reason
p.132 If tuneful flutes grew on olive trees, you would assume the olive had some knowledge of the flute
p.203 Someone who says 'it is day' proposes it is day, and it is true if it is day [Diog. Laertius]
p.267 When a slave said 'It was fated that I should steal', Zeno replied 'Yes, and that you should be beaten' [Diog. Laertius]
p.268 When shown seven versions of the mowing argument, he paid twice the asking price for them [Diog. Laertius]
p.280 A sentence always has signification, but a word by itself never does [Diog. Laertius]
p.291 Since we are essentially rational animals, living according to reason is living according to nature [Diog. Laertius]
p.386 A dog tied to a cart either chooses to follow and is pulled, or it is just pulled [Hippolytus]
p.425 Zeno says there are four main virtues, which are inseparable but distinct [Plutarch]
p.447 Zeno saw virtue as a splendid state, not just a source of splendid action [Cicero]
p.449 Incorporeal substances can't do anything, and can't be acted upon either [Cicero]
p.541 A presentation is true if we judge that no false presentation could appear like it [Cicero]