8 ideas
| 291 | Don't assume that wisdom is the automatic consequence of old age [Plato] |
| 19404 | Necessities rest on contradiction, and contingencies on sufficient reason [Leibniz] |
| 10496 | Monothetic categories have fixed defining features, and polythetic categories do not [Ellen] |
| 10497 | In symbolic classification, the categories are linked to rules [Ellen] |
| 10495 | Continuous experience sometimes needs imposition of boundaries to create categories [Ellen] |
| 10498 | Classification is no longer held to be rooted in social institutions [Ellen] |
| 293 | Being unafraid (perhaps through ignorance) and being brave are two different things [Plato] |
| 19403 | Each of the infinite possible worlds has its own laws, and the individuals contain those laws [Leibniz] |