Arithmetic is a kind of knowledge in which the best natures should be trained, and which must not be given up.

This world is indeed a living being endowed with a soul and intelligence ... a single visible living entity containing all other living entities, which by their nature are all related.

To conquer oneself is the best and noblest victory; to be vanquished by one's own nature is the worst and most ignoble defeat.

The judge should not be young, he should have learned to know evil, not from his own soul, but from late and long observation of the nature of evil in others.

There should be no element of slavery in learning. Enforced exercise does no harm to the body, but enforced learning will not stay in the mind. So avoid compulsion, and let your children's lessons take the form of play.

No one knows whether death may not be the greatest good that can happen to man.

Philosophy is the highest music.