Reductio ad absurdum, which Euclid loved so much, is one of a mathematicians finest weapons. It is a far finer gambit than any chess play: a chess player may offer the sacrifice of a pawn or even a piece, but a mathematician offers the game.

Als de melk overkookt, stinkt de stoof.

Niet armoede is het probleem, maar rijkdom.

Before you embark on a journey of revenge, dig two graves.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self.