There are three signs of senility. The first sign is that a man forgets his theorems. The second sign is that he forgets to zip up. The third sign is that he forgets to zip down.

Property is a nuisance.

Finally I am becoming stupider no more.

God created two acts of folly. First, He created the Universe in a Big Bang. Second, He was negligent enough to leave behind evidence for this act, in the form of microwave radiation.

Every human activity, good or bad, except mathematics, must come to an end.

You don't have to believe in God, but you should believe in The Book.

God may not play dice with the universe, but something strange is going on with the prime numbers.