We must learn to see the world anew.

It is the same with people as it is with riding a bike. Only when moving can one comfortably maintain one's balance.

A hundred times every day I remind myself that my inner and outer life are based on the labors of others.

Women always worry about things that men forget; men always worry about things women remember.

It is a very grave mistake to think that the enjoyment of seeing and searching can be promoted by means of coercion and a sense of duty. To the contrary, I believe it would be possible to rob even a healthy beast of prey of its voraciousness, if it were possible, with the aid of a whip, to force the beast to devour continuously, even when not hungry.

Curiosity has its own reason for existence.

The Nuremberg Trial of the German war criminals was tacitly based on the recognition of the principle: criminal actions cannot be excused if committed on government orders; conscience supersedes the authority of the law of the state.