For what a man would like to be true, that he more readily believes.

[Science is] the labor and handicraft of the mind.

A good conscience is a continual feast.

There is as much difference between the counsel that a friend giveth, and that a man giveth himself, as there is between the counsel of a friend and of a flatterer. For there is no such flatterer as is a man's self.

All artists are vain, they long to be recognized and to leave something to posterity. They want to be loved, and at the same time they want to be free. But nobody is free.

The root of all superstition is that men observe when a thing hits, but not when it misses.

Begin doing what you want to do now. We are not living in eternity. We have only this moment, sparkling like a star in our hand - and melting like a snowflake.