No science can be more secure than the unconscious metaphysics which tacitly it presupposes.

Life is complex in its expression, involving more than percipience, namely desire, emotion, will, and feeling.

There is no more common error than to assume that, because prolonged and accurate mathematical calculations have been made, the application of the result to some fact of nature is absolutely certain.

The science of pure mathematics, in its modern developments, may claim to be the most original creation of the human spirit.

When you're average, you're just as close to the bottom as you are the top.

You may not divide the seamless coat of learning.

Art flourishes where there is a sense of adventure, a sense of nothing having been done before, of complete freedom to experiment.