I do not think there is any other mental strain comparable to the exertion to which a tournament game subjects the chess master. Working at what seemed to me the most difficult mathematical problems has never exhausted me nearly as much as playing in a chess tournament; and of all intellectual applications mathematical work is surely the hardest. That is why physical fitness is a most important factor in tournament chess and why young players, whose brains can stand the poisons of fatigue much longer than those of older players have a great advantage.

The result is never so important. It is much more important that you are happy with what you are doing than with the result of it.

The object of mathematics is the honor of the human spirit.

Als je nooit risico’s neemt, loop je pas echt risico.

The real voyage of discovery lies not in seeking new landscapes but in having new eyes.