Religion is what the individual does with his own solitariness.

Inventive genius requires pleasurable mental activity as a condition for its vigorous exercise. "Necessity is the mother of invention" is a silly proverb. "Necessity is the mother of futile dodges" is much closer to the truth. The basis of growth of modern invention is science, and science is almost wholly the outgrowth of pleasurable intellectual curiosity.

Fertilization of the soul is the reason for the necessity of art.

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.

The difference between ancients and moderns is that the ancients asked what have we experienced, and moderns asked what can we experience.

After you understand about the sun and the stars and the rotation of the earth, you may still miss the radiance of the sunset.

The ultimate metaphysical ground is the creative advance into novelty.