21 ideas
| 192 | Only one thing can be contrary to something [Plato] |
| 9358 | There are several logics, none of which will ever derive falsehoods from truth [Lewis,CI] |
| 9357 | Excluded middle is just our preference for a simplified dichotomy in experience [Lewis,CI] |
| 9364 | Names represent a uniformity in experience, or they name nothing [Lewis,CI] |
| 190 | If asked whether justice itself is just or unjust, you would have to say that it is just [Plato] |
| 9362 | Necessary truths are those we will maintain no matter what [Lewis,CI] |
| 20184 | The only real evil is loss of knowledge [Plato] |
| 20185 | The most important things in life are wisdom and knowledge [Plato] |
| 9365 | We can maintain a priori principles come what may, but we can also change them [Lewis,CI] |
| 191 | Everything resembles everything else up to a point [Plato] |
| 9361 | We have to separate the mathematical from physical phenomena by abstraction [Lewis,CI] |
| 203 | Courage is knowing what should or shouldn't be feared [Plato] |
| 202 | No one willingly and knowingly embraces evil [Plato] |
| 193 | Some things are good even though they are not beneficial to men [Plato] |
| 200 | People tend only to disapprove of pleasure if it leads to pain, or prevents future pleasure [Plato] |
| 197 | Some pleasures are not good, and some pains are not evil [Plato] |
| 188 | Socrates did not believe that virtue could be taught [Plato] |
| 189 | If we punish wrong-doers, it shows that we believe virtue can be taught [Plato] |
| 204 | Socrates is contradicting himself in claiming virtue can't be taught, but that it is knowledge [Plato] |
| 7903 | The six perfections are giving, morality, patience, vigour, meditation, and wisdom [Nagarjuna] |
| 9363 | Science seeks classification which will discover laws, essences, and predictions [Lewis,CI] |