Scientists do not believe in fundamental and absolute certainties. For the scientist, certainty is never an end, but a search; not the ordering of certainty, but its exploration. For the scientist, certainty represents the highest degree of probability.

Hell has been described as a pocket edition of Chicago.

By virtue of being born to humanity, every human being has a right to the development and fulfillment of his potentialities as a human being.

The loving touch, like music, often utters the things that cannot be spoken.

It's by what you do that you communicate to others that you are deeply involved in their well being.

The indifference, callousness and contempt that so many people exhibit toward animals is evil first because it results in great suffering in animals, and second because it results in an incalculably great impoverishment of the human spirit. All education should be directed toward the refinement of the individual's sensibilities in relation not only to one's fellow humans everywhere, but to all things whatsoever.

Man is the only 150 pound nonlinear servomechanism that can be wholly reproduced by unskilled labor.