In common things the law of sacrifice takes the form of positive duty.

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.

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

A person possessed with an idea cannot be reasoned with.

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