"Belief in the truth commences with the doubting of all those "truths" we once believed."

Reason is the cause of our falsification of the evidence of the senses. In so far as the senses show becoming, passing away, change, they do not lie.

It seems to me that to take a book of mine into his hands is one of the rarest distinctions that anyone can confer upon himself. I even assume that he removes his shoes when he does so-not to speak of boots.

There are horrible people who, instead of solving a problem, tangle it up and make it harder to solve for anyone who wants to deal with it. Whoever does not know how to hit the nail on the head should be asked not to hit it at all.

Ten times must you laugh during the day, and be cheerful; otherwise your stomach, the father of affliction, will disturb you in the night.

Free will without fate is no more conceivable than spirit without matter, good without evil.

In almost all sciences the fundamental knowledge is either found in earliest times or is still being sought.