It behooves those who take the young to task to leave them room for excuse, lest they drive them to be hardened by too much rebuke.

And what, Socrates, is the food of the soul? Surely, I said, knowledge is the food of the soul.

The wise man will want to be ever with him who is better than himself.

Mathematics is like draughts in being suitable for the young, not too difficult, amusing, and without peril to the state.

The fear of death is indeed the pretence of wisdom, and not real wisdom, being the appearance of knowing the unknown.

The ludicrous state of solid geometry made me pass over this branch.

I fear this is not the right exchange to attain virtue, to exchange pleasures for pleasures, pains for pains and fears for fears, the greater for the less like coins, but that the only valid currency for which all these things should be exchanged is wisdom.