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

The history of thought may be summed up in these words: it is absurd by what it seeks and great by what it finds.

The universe is built on a plan the profound symmetry of which is somehow present in the inner structure of our intellect.

The mind has transformed the world, and the world is repaying it with interest. It has led man where he had no idea how to go.

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

Talent without genius isn't much, but genius without talent is nothing whatsoever.

Books have the same enemies as people: fire, humidity, animals, weather, and their own content.