I'll tell you once, and I'll tell you again. There's always a prime between n and 2n.

I know numbers are beautiful. If they aren't beautiful, nothing is.

Another roof, another proof.

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.

There'll be plenty of time to rest in the grave.

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

Végre nem butulok tovább (I've finally stopped getting dumber).