There is far greater peril in buying knowledge than in buying meat and drink.

Democracy passes into despotism.

You can remember, a single deluge only, but there were many previous ones.

When a person supposes that he knows, and does not know; this appears to be the great source of all the errors of the intellect.

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

Those wretches who never have experienced the sweets of wisdom and virtue, but spend all their time in revels and debauches, sink downward day after day, and make their whole life one continued series of errors.

That man is wisest who, like Socrates, realizes that his wisdom is worthless