The first duty of an historian is to be on guard against his own sympathies.

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

Experience teaches slowly and at the cost of mistakes.

To deny the freedom of the will is to make morality impossible.

Science rests on reason and experiment, and can meet an opponent with calmness; but a belief is always sensitive.

A person possessed with an idea cannot be reasoned with.

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.

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

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

The superstition of science scoffs at the superstition of faith.

The essence of greatness is neglect of the self.

Human improvement is from within outward.