# Book IX: The Skeptics and the Eleatic School explained — The Lives and Opinions of Eminent Philosophers

> Chapter companion for The Lives and Opinions of Eminent Philosophers by Diogenes Laërtius.

## What happens

This chapter covers the lives and doctrines of Xenophanes, Parmenides, Melissus, Zeno the Eleatic, Democritus, and Pyrrho, detailing their philosophical contributions, personal anecdotes, and the skeptical tradition that traces back to Homer and the Seven Sages.

## Themes in this chapter

### Origins and Succession of Philosophical Schools

Traces the lineage from Xenophanes to Parmenides, Melissus, Zeno, and the skeptical tradition of Pyrrho.

### Natural Philosophy and Cosmology

Parmenides' spherical earth and central universe; Melissus' infinite and immovable universe; Democritus' atomic theory.

### Death and Legacy

Xenophanes buried his sons; Democritus prolonged his life to attend the Thesmophoria; Pyrrho's calm acceptance of mortality.

## Character check-ins

### Xenophanes

Founder of the Eleatic school; buried his sons with his own hands; flourished around the 60th Olympiad.

### Parmenides

Pupil of Xenophanes and Anaximander; first to assert the earth is spherical; discovered Hesperus and Lucifer are the same star.

### Melissus of Samos

Pupil of Parmenides; admiral and statesman; taught the universe is infinite, immovable, and one.

### Zeno of Citium

Native of Velia; pupil of Parmenides; first to use the 'Achilles' argument; wrote treatises in various forms.

### Democritus

Wrote the 'Great World' and 'Little World'; lived over 100 years; Plato allegedly wished to burn his writings.

### Pyrrho

Founder of the skeptical school; maintained calm during storms; enemy of Sophists; disciples included Timon and Nausiphanes.

## Key lines

> And 'twill be needful for you well to know, The fearless heart of all-convincing truth: Also the opinions, though less sure, of men, Which rest upon no certain evidence.

You must understand both the certain truth and the uncertain opinions of men.

_Parmenides distinguishes between truth and opinion._

> Let not the common usages of men Persuade your better taught experience, To trust to men's unsafe deceitful sight, Or treacherous ears, or random speaking tongue: Reason alone will prove the truth of facts.

Do not rely on senses; only reason reveals truth.

_Parmenides advocates for reason over sensory perception._

> And no man knows distinctly anything, And no man ever will.

No one can have certain knowledge of anything.

_Xenophanes expresses skepticism._

> The object moved does not move either in the place in which it is

A moving object cannot move in the place where it is.

_Zeno's argument against motion._

## Links

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