Ideas from 'works (fragments)' by Zeno (Citium) [294 BCE], by Theme Structure

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1. Philosophy / A. Wisdom / 2. Wise People
A wise man's chief strength is not being tricked; nothing is worse than error, frivolity or rashness [Cicero]
1. Philosophy / D. Nature of Philosophy / 4. Divisions of Philosophy
Philosophy has three parts, studying nature, character, and rational discourse [Diog. Laertius]
3. Truth / H. Deflationary Truth / 3. Minimalist Truth
Someone who says 'it is day' proposes it is day, and it is true if it is day [Diog. Laertius]
7. Existence / A. Nature of Existence / 7. Criterion for Existence
Whatever participates in substance exists [Stobaeus]
11. Knowledge Aims / A. Knowledge / 7. Knowledge First
A grasp by the senses is true, because it leaves nothing out, and so nature endorses it [Cicero]
13. Knowledge Criteria / A. Justification Problems / 1. Justification / c. Defeasibility
If a grasped perception cannot be shaken by argument, it is 'knowledge' [Cicero]
17. Mind and Body / E. Mind as Physical / 5. Causal Argument
A body is required for anything to have causal relations [Cicero]
19. Language / A. Nature of Meaning / 7. Meaning Holism / a. Sentence meaning
A sentence always has signification, but a word by itself never does [Diog. Laertius]
22. Metaethics / A. Value / 1. Nature of Value / f. Ultimate value
The goal is to 'live in agreement', according to one rational consistent principle [Stobaeus]
22. Metaethics / C. Ethics Foundations / 2. Source of Ethics / k. Ethics from nature
Zeno said live in agreement with nature, which accords with virtue [Diog. Laertius]
Since we are essentially rational animals, living according to reason is living according to nature [Diog. Laertius]
23. Ethics / C. Virtue Theory / 1. Virtue Theory / a. Nature of virtue
Zeno saw virtue as a splendid state, not just a source of splendid action [Cicero]
23. Ethics / C. Virtue Theory / 3. Virtues / a. Virtues
Zeno says there are four main virtues, which are inseparable but distinct [Plutarch]
27. Natural Reality / C. Space-Time / 1. Space / a. Void
There is no void in the cosmos, but indefinite void outside it [Ps-Plutarch]
27. Natural Reality / D. Cosmology / 1. Cosmology
Since the cosmos produces what is alive and rational, it too must be alive and rational
Things are more perfect if they have reason; nothing is more perfect than the universe, so it must have reason
28. God / B. Proving God / 2. Proofs of Reason / a. Ontological Proof
Rational is better than non-rational; the cosmos is supreme, so it is rational
28. God / B. Proving God / 3. Proofs of Evidence / b. Teleological Proof
If tuneful flutes grew on olive trees, you would assume the olive had some knowledge of the flute
28. God / C. Attitudes to God / 2. Pantheism
The cosmos and heavens are the substance of god