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.

The scientist believes in proof without certainty, the bigot in certainty without proof.

Psychosclerosis: the hardening of the attitude which causes a person to cease dreaming, seeing, thinking, and leading.

In teaching it is the method and not the content that is the message.

The original mixed ancestry of the Jews and their subsequent history of intermixture with every people among whom they have lived and continue to live.

The majority of people believe in incredible things which are absolutely false. The majority of people daily act in a manner prejudicial to their general well-being.

Girls marry for love. Boys marry because of a chronic irritation that causes them to gravitate in the direction of objects with certain curvilinear properties.