10 ideas
3035 | Dialectic involves conversations with short questions and brief answers [Diog. Laertius] |
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) |
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. |
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) |
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) |
3033 | Induction moves from some truths to similar ones, by contraries or consequents [Diog. Laertius] |
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) |
9471 | Intensions are creatures of darkness which should be exorcised [Quine] |
Full Idea: Intensions are creatures of darkness and I shall rejoice with the reader when they are exorcised. | |
From: Willard Quine (Quantifiers and Propositional Attitudes [1955], §II) | |
A reaction: Quine seems to be in a diminshing minority with this view. For 'intensions' read 'meanings', presumably. |
1838 | Cyrenaic pleasure is a motion, but Epicurean pleasure is a condition [Diog. Laertius] |
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. |
1769 | Cynics believe that when a man wishes for nothing he is like the gods [Diog. Laertius] |
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) |
1748 | Archelaus was the first person to say that the universe is boundless [Archelaus, by Diog. Laertius] |
Full Idea: Archelaus was the first person to say that the universe is boundless. | |
From: report of Archelaus (fragments/reports [c.450 BCE]) by Diogenes Laertius - Lives of Eminent Philosophers 02.Ar.3 |
5989 | Archelaus said life began in a primeval slime [Archelaus, by Schofield] |
Full Idea: Archelaus wrote that life on Earth began in a primeval slime. | |
From: report of Archelaus (fragments/reports [c.450 BCE]) by Malcolm Schofield - Archelaus | |
A reaction: This sounds like a fairly clearcut assertion of the production of life by evolution. Darwin's contribution was to propose the mechanism for achieving it. We should honour the name of Archelaus for this idea. |