Sex was invented as a biological instrument by (say) the green algae. But as an instrument in the ascent of man which is basic to his cultural evolution, it was invented by man himself.

The world can only be grasped by action, not by contemplation.

Whether our work is art or science or the daily work of society, it is only the form in which we explore our experience which is different.

One original thought is worth the sum total of human knowledge, because it advances the sum total of human knowledge by that one original thought.

In the moment of appreciation we live again the moment when the creator saw and held the hidden likeness.

All science is the search for unity in hidden likenesses.

The most remarkable discovery made by scientists is science itself. The discovery must be compared in importance with the invention of cave-painting and of writing. Like these earlier human creations, science is an attempt to control our surroundings by entering into them and understanding them from inside. And like them, science has surely made a critical step in human development which cannot be reversed. We cannot conceive a future society without science.