5 ideas
| 291 | Don't assume that wisdom is the automatic consequence of old age [Plato] |
| 10053 | Geometrical axioms imply the propositions, but the former may not be true [Russell] |
| 10052 | Geometry is united by the intuitive axioms of projective geometry [Russell, by Musgrave] |
| 6004 | The cardinal virtues are theoretical (based on knowledge), and others are 'non-theoretical' [Hecato, by Dorandi] |
| 293 | Being unafraid (perhaps through ignorance) and being brave are two different things [Plato] |