I am actually not at all a man of science, not an observer, not an experimenter, not a thinker. I am by temperament nothing but a conquistador

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The drive to resist compulsion is more important in wild animals than sex, food, or water. He found that captive white-footed mice spent inordinate time and energy just resisting experimental manipulation. If the experimenters turned the lights up, the mouse spent his time turning them down. If the experimenter turned the lights down, the mouse turned them up. The drive for competence or to resist compulsion is a drive to avoid helplessness.

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The cruel experimenter cannot be allowed to have it both ways. He cannot, in the same breath, defend the scientific validity of vivisection on the grounds of the physical similarities between man and the other animals, and then defend the morality of vivisection on the grounds that men and animals are physically different. The only logical alternatives for him are to admit he is either pre-Darwinian or immoral.

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No one but a theorist believes his theory; everyone puts faith in a laboratory result but the experimenter himself.

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The true worth of an experimenter consists in his pursuing not only what he seeks in his experiment, but also what he did not seek.

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