As the area of light expands, so does the perimeter of darkness.

The conflict that exists today is no more than an old-style struggle for power, once again presented to mankind in semireligious trappings. The difference is that, this time, the development of atomic power has imbued the struggle with a ghostly character; for both parties know and admit that, should the quarrel deteriorate into actual war, mankind is doomed.

Teaching should be such that what is offered is perceived as a valuable gift and not as hard duty. Never regard study as duty but as the enviable opportunity to learn to know the liberating influence of beauty in the realm of the spirit for your own personal joy and to the profit of the community to which your later work belongs.

The history of scientific and technical discovery teaches us that the human race is poor in independent and creative imagination.

A man must learn to understand the motives of human beings, their illusions, and their sufferings.

The heart says yes, but the mind says no.

The health of society thus depends quite as much on the independence of the individuals composing it as on their close political cohesion.