Anyone who cannot cope with mathematics is not fully human. At best, he is a tolerable subhuman who has learned to wear his shoes, bathe, and not make messes in the house.

English is capable of defining sentiments that the human nervous system is quite incapable of experiencing.

Butterflies are not insects,' Captain John Sterling said soberly. 'They are self-propelled flowers.

The way to find justice is to deal fairly with other people and not worry about how they deal with you.

Talking with a Martian is like talking with an echo. You don't get argument but you don't get results.

There are hidden contradictions in the minds of people who "love Nature" while deploring the "artificialities" with which "Man has spoiled Nature.'" The obvious contradiction lies in their choice of words, which imply that Man and his artifacts are not part of "Nature" : but beavers and their dams are.

Abstract knowledge is always useful, sooner or later.