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Single Idea 1819

[filed under theme 13. Knowledge Criteria / D. Scepticism / 1. Scepticism ]

Full Idea

Sceptics actually assert two dogmas: that nothing should be defined, and that every argument has an opposite argument.

Gist of Idea

Scepticism has two dogmas: that nothing is definable, and every argument has an opposite argument

Source

Diogenes Laertius (Lives of Eminent Philosophers [c.250], 9.Py.11)

Book Ref

Diogenes Laertius: 'Diogenes Laertius', ed/tr. Yonge,C.D. [Henry G. Bohn 1853], p.418


The 7 ideas from 'Lives of Eminent Philosophers'

Induction moves from some truths to similar ones, by contraries or consequents [Diog. Laertius]
Dialectic involves conversations with short questions and brief answers [Diog. Laertius]
Cynics believe that when a man wishes for nothing he is like the gods [Diog. Laertius]
When sceptics say that nothing is definable, or all arguments have an opposite, they are being dogmatic [Diog. Laertius]
Sceptics say demonstration depends on self-demonstrating things, or indemonstrable things [Diog. Laertius]
Scepticism has two dogmas: that nothing is definable, and every argument has an opposite argument [Diog. Laertius]
Cyrenaic pleasure is a motion, but Epicurean pleasure is a condition [Diog. Laertius]