3 ideas
| 7536 | If you hope to improve the world, all you can do is improve yourself [Wittgenstein] |
| 9141 | Abstraction theories build mathematics out of second-order equivalence principles [Cook/Ebert] |
| 20239 | Unlike us, the early Greeks thought envy was a good thing, and hope a bad thing [Hesiod, by Nietzsche] |