No person is ever good for much, that hasn't been swept off their feet by enthusiasm between ages twenty and thirty.

Experience teaches slowly and at the cost of mistakes.

Philosophy goes no further than probabilities, and in every assertion keeps a doubt in reserve.

The better one is morally the less aware they are of their virtue.

Our human laws are more or less imperfect copies of the external laws as we see them.

Wild animals never kill for sport. Man is the only one to whom the torture and death of his fellow creatures is amusing in itself.