Men are in general so tricky, so envious, and so cruel that when we find one who is only weak, we are too happy.

It is up to us to cultivate our garden.

Chess is a game which reflects most honor on human wit.

Madness is to think of too many things in succession too fast, or of one thing too exclusively.

Opinion is called the queen of the world; it is so, for when reason opposes it, it is condemned to death. It must rise twenty times from its ashes to gradually drive away the usurper.

Every one should be his own physician. We ought to assist, and not to force nature. Eat with moderation...Nothing is good for the body but what we can digest. What medicine can procure digestion? Exercise. What will recruit strength? Sleep.

When we cannot use the compass of mathematics or the torch of experience...it is certain we cannot take a single step forward.