A man must keep an eye on his servants, if he would not have them rule him.

Knowledge, Virtue, Power are the victories of man over his necessities, his march to the dominion of the world.

It is not length of life, but depth of life.

To a dull mind all of nature is leaden. To the illumined mind the whole world burns and sparkles with light.

Whence, then, this worship of the past? The centuries are conspirators against the sanity and authority of the soul.

I hate the giving of the hand unless the whole man accompanies it.

Colleges hate geniuses, just as convents hate saints.