Ideas from 'Lives of Eminent Philosophers' by Diogenes Laertius [250], by Theme Structure

[found in 'Diogenes Laertius' by Diogenes Laertius (ed/tr Yonge,C.D.) [Henry G. Bohn 1853,-]].

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2. Reason / C. Styles of Reason / 1. Dialectic

3035	Dialectic involves conversations with short questions and brief answers

			Full Idea: Dialectic is when men converse by putting short questions and giving brief answers to those who question them.
			From: Diogenes Laertius (Lives of Eminent Philosophers [c.250], 3.1.52)

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

			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

			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

			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)

14. Science / C. Induction / 4. Reason in Induction

3033	Induction moves from some truths to similar ones, by contraries or consequents

			Full Idea: Induction is an argument which by means of some admitted truths establishes naturally other truths which resemble them; there are two kinds, one proceeding from contraries, the other from consequents.
			From: Diogenes Laertius (Lives of Eminent Philosophers [c.250], 3.1.23)

22. Metaethics / C. The Good / 3. Pleasure / b. Types of pleasure

1838	Cyrenaic pleasure is a motion, but Epicurean pleasure is a condition

			Full Idea: Cyrenaics place pleasure wholly in motion, whereas Epicurus admits it as a condition.
			From: Diogenes Laertius (Lives of Eminent Philosophers [c.250], 10.28)
			A reaction: Not a distinction we meet in modern discussions. Do events within the mind count as 'motion'? If so, these two agree. If not, I'd vote for Epicurus.

23. Ethics / A. Egoism / 1. Ethical Egoism

1769	Cynics believe that when a man wishes for nothing he is like the gods

			Full Idea: Cynics believe that when a man wishes for nothing he is like the gods.
			From: Diogenes Laertius (Lives of Eminent Philosophers [c.250], 6.Men.3)