Learning preserves the errors of the past as well as its wisdom.

Science repudiates philosophy. In other words, it has never cared to justify its truth or explain its meaning.

The many become one and are increased by one.

It is impossible to meditate on time and the mystery of nature without an overwhelming emotion at the limitations of human intelligence.

To come very near to a true theory, and to grasp its precise application, are two different things, as the history of science teaches us. Everything of importance has been said before by someone who did not discover it.

Religion is what the individual does with his own solitariness. Thus religion is solitariness; and if you are never solitary, you are never religious.

Through and through the world is infested with quantity: To talk sense is to talk quantities. It is no use saying the nation is large. . . . How large? It is no use saying the radium is scarce. . . . How scarce? You cannot evade quantity. You may fly to poetry and music, and quantity and number will face you in your rhythms and your octaves.