| Quote | Philosopher | Extra Info |
| 'Nothing is more active than thought, for it travels over the universe, and nothing is stronger than necessity for all must submit to it.' | |
| 'No man ever steps in the same river twice, for it's not the same river and he's not the same man.' | |
| 'Thought is the fountain of speech' | |
| 'First learn the meaning of what you say and then speak' | |
| 'I only know that I know nothing' | |
| 'Wise men talk because they have something to say; fools, because they have to say something.' | |
| 'Law is mind without reason.' | |
| 'Of all things the measure is man, of the things that are, that they are, and of things that are not, that they are not.' | |
| 'Why not whip the teacher when the pupil misbehaves? ' | |
| 'Nothing exists except atoms and empty space; everything else is opinion' | |
| 'The reason we have two ears and only one mouth, is that we may hear more and speak less.' | |
| 'The wise are instructed by reason, average minds by experience, the stupid by necessity and the brute by instinct.' | |