Our most important thoughts are those that contradict our emotions.

Just as water, gas, and electricity are brought into our houses from far off to satisfy our needs in response to a minimal effort, so we shall be supplied with visual or auditory images, which will appear and disappear at a simple movement of the hand, hardly more than a sign.

God created man and, finding him not sufficiently alone, gave him a companion to make him feel his solitude more keenly.

That which has been believed by everyone, always and everywhere, has every chance of being false.

In the physical world, one cannot increase the size or quantity of anything without changing its quality. Similar figures exist only in pure geometry.

The world acquires value only through its extremes and endures only through moderation; extremists make the world great, the moderates give it stability.

Great things are accomplished by those who do not feel the impotence of man. This is a precious gift.