Knowing all truth is less than doing a little bit of good.

Everything deep is also simple and can be reproduced simply as long as its reference to the whole truth is maintained. But what matters is not what is witty but what is true.

Just as white light consists of colored rays, so reverence for life contains all the components of ethics: love, kindliness, sympathy, empathy, peacefulness and power to forgive.

A man is ethical only when life, as such, is sacred to him, that of plants and animals as that of his fellow men, and when he devotes himself helpfully to all life that is in need of help.

An optimist is a person who sees a green light everywhere, while a pessimist sees only the red stoplight... the truly wise person is colorblind.

To the truly ethical man, all of life is sacred, including forms of life that from the human point of view may seem lower than ours.

For us the great men are not those who solved the problems, but those whodiscovered them.