I decry the current tendency to seek patents on algorithms. There are better ways to earn a living than to prevent other people from making use of one’s contributions to computer science.

Without mathematics we might as well live in a cave.

If you don’t believe in victory you have no business sitting down at a chess board.

Proof is the idol before whom the pure mathematician tortures himself.

Als g’u kunt verbeteren, moet ge dat doen.