Most new discoveries are suddenly-seen things that were always there.

A mind that is very selective to forms... is apt to use its images metaphorically, to exploit their possible significance for the conception of remote or intangible ideas.

Language is, without a doubt, the most momentous and at the same time the most mysterious product of the human mind.

Real thinking is possible only in the light of genuine language, no matter how limited, how primitive.

Art is the creation of forms symbolic of human feeling.

Speech is the mark of humanity. It is the normal terminus of thought.

The faith of scientists in the power and truth of mathematics is so implicit that their work has gradually become less and less observation, and more and more calculation.... But the facts which are accepted by virtue of these tests are not actually observed at all.