The true science and study of man is man.

Pleasure and pain, though directly opposite are contrived to be constant companions.

The advice of friends must be received with a judicious reserve; we must not give ourselves up to it and follow it blindly, whether right or wrong.

The easiest way to be cheated is to believe yourself to be more cunning than others.

He who receives a benefit should never forget it; he who bestow should never remember it.