The conception of worth, that each person is an end per se, is not a mere abstraction. Our interest in it is not merely academic. Every outcry against the oppression of some people by other people, or against what is morally hideous is the affirmation of the principle that a human being as such is not to be violated. A human being is not to be handled as a tool but is to be respected and revered.

– An Ethical Philosophy of Life