6 ideas
21753 | If we look at the world rationally, the world assumes a rational aspect [Hegel] |
Full Idea: Whoever looks at the world rationally will find that it in turn assumes a rational aspect; the two exist in a reciprocal relationship. | |
From: Georg W.F.Hegel (Lectures on the Philosophy of (World) History [1837], p.29), quoted by Stephen Houlgate - An Introduction to Hegel 01 | |
A reaction: What happens when I look at irrationality rationally? |
21974 | The world seems rational to those who look at it rationally [Hegel] |
Full Idea: To him who looks at the world rationally, the world looks rationally back; the two exist in reciprocal relationship. | |
From: Georg W.F.Hegel (Lectures on the Philosophy of (World) History [1837], Intro p.29), quoted by A.W. Moore - The Evolution of Modern Metaphysics 07.4 | |
A reaction: This is a nice variation on the stoic idea that nature is essentially rational. If we are capable of rationality, then nature has made us that way. Romantics seem to prefer looking at nature less rationally, so what do they see in nature? |
3338 | Numbers have been defined in terms of 'successors' to the concept of 'zero' [Peano, by Blackburn] |
Full Idea: Dedekind and Peano define the number series as the series of successors to the number zero, according to five postulates. | |
From: report of Giuseppe Peano (works [1890]) by Simon Blackburn - Oxford Dictionary of Philosophy p.279 |
5897 | 0 is a non-successor number, all successors are numbers, successors can't duplicate, if P(n) and P(n+1) then P(all-n) [Peano, by Flew] |
Full Idea: 1) 0 is a number; 2) The successor of any number is a number; 3) No two numbers have the same successor; 4) 0 is not the successor of any number; 5) If P is true of 0, and if P is true of any number n and of its successor, P is true of every number. | |
From: report of Giuseppe Peano (works [1890]) by Antony Flew - Pan Dictionary of Philosophy 'Peano' | |
A reaction: Devised by Dedekind and proposed by Peano, these postulates were intended to avoid references to intuition in specifying the natural numbers. I wonder if they could define 'successor' without reference to 'number'. |
13304 | Learned men gain more in one day than others do in a lifetime [Posidonius] |
Full Idea: In a single day there lies open to men of learning more than there ever does to the unenlightened in the longest of lifetimes. | |
From: Posidonius (fragments/reports [c.95 BCE]), quoted by Seneca the Younger - Letters from a Stoic 078 | |
A reaction: These remarks endorsing the infinite superiority of the educated to the uneducated seem to have been popular in late antiquity. It tends to be the religions which discourage great learning, especially in their emphasis on a single book. |
20820 | Time is an interval of motion, or the measure of speed [Posidonius, by Stobaeus] |
Full Idea: Posidonius defined time thus: it is an interval of motion, or the measure of speed and slowness. | |
From: report of Posidonius (fragments/reports [c.95 BCE]) by John Stobaeus - Anthology 1.08.42 | |
A reaction: Hm. Can we define motion or speed without alluding to time? Looks like we have to define them as a conjoined pair, which means we cannot fully understand either of them. |