I can promise to be sincere, but I cannot promise to be impartial.

Man is not born to solve the problem of the universe, but to find out what he has to do; and to restrain himself within the limits of his comprehension.

You can put up with everything in this world except not with a long stretch of beautiful days.

The artist alone sees spirits. But after he has told of their appearing to him, everybody sees them.

Certain books seem to be written, not that we might learn from them, but in order that we might see how much the author knows.

If you wish a wise answer, you must put a rational question.

Nothing is true, but that which is simple.