A person possessed with an idea cannot be reasoned with.

You cannot dream yourself into a character; you must hammer and forge yourself one.

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

Age does not make us childish, as some say; it finds us true children.

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

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.