The enormous mental resilience, without which no Chess player can exist, was so much taken up by Chess that he could never free his mind of this game

Energy cannot be created or destroyed, it can only be changed from one form to another.

Laws alone can not secure freedom of expression; in order that every man present his views without penalty there must be spirit of tolerance in the entire population.

You can never solve a problem on the level on which it was created. Insanity: doing the same thing over and over again and expecting different results. A life lived for others is a life worthwhile.

It is little short of a miracle that modern methods of instruction have not already completely strangled the holy curiosity of inquiry.... I believe that one could even deprive a healthy beast of prey of its voraciousness if one could force it with a whip to eat continuously whether it were hungry or not.

The height of stupidity is most clearly demonstrated by the individual who ridicules something he knows nothing about.

A forced faithfulness is a bitter fruit for all concerned.