Combining Philosophers

Ideas for Peter B. Lewis, Diogenes Laertius and Ralph Cudworth

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3 ideas

13. Knowledge Criteria / A. Justification Problems / 2. Justification Challenges / a. Agrippa's trilemma

1816	Sceptics say demonstration depends on self-demonstrating things, or indemonstrable things [Diog. Laertius]
	Full Idea: Sceptics say that every demonstration depends on things which demonstrates themselves, or on things which can't be demonstrated.
	From: Diogenes Laertius (Lives of Eminent Philosophers [c.250], 9.Py.11)
	A reaction: This refers to two parts of Agrippa's Trilemma (the third being that demonstration could go on forever). He makes the first option sound very rationalist, rather than experiential.

13. Knowledge Criteria / D. Scepticism / 1. Scepticism

1819	Scepticism has two dogmas: that nothing is definable, and every argument has an opposite argument [Diog. Laertius]
	Full Idea: Sceptics actually assert two dogmas: that nothing should be defined, and that every argument has an opposite argument.
	From: Diogenes Laertius (Lives of Eminent Philosophers [c.250], 9.Py.11)

13. Knowledge Criteria / D. Scepticism / 6. Scepticism Critique

3064	When sceptics say that nothing is definable, or all arguments have an opposite, they are being dogmatic [Diog. Laertius]
	Full Idea: When sceptics say that they define nothing, and that every argument has an opposite argument, they here give a positive definition, and assert a positive dogma.
	From: Diogenes Laertius (Lives of Eminent Philosophers [c.250], 9.11.11)