Boys should abstain from all use of wine until their eighteenth year, for it is wrong to add fire to fire.

All men, well interrogated, answer well.

Ignorance: the root of all evil.

Arguments, like men, are often pretenders.

The life which is not examined is not worth living.

The eyes of the soul of the multitudes are unable to endure the vision of the divine.

The first step in learning is the destruction of human conceit.