"When white-collar people get jobs, they sell not only their time and energy, but their personalities as well. They sell by the week, or month, their smiles and their kindly gestures, and they must practice that prompt repression of resentment and aggression."

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Man is still by instinct a predatory animal given to devilish aggression. The discoveries of science have immensely increased productivity of material things. They have increased the standards of living and comfort. They have eliminated infinite drudgery. They have increased leisure. But that gives more time for devilment. The work of science has eliminated much disease and suffering. It has increased the length of life. That, together with increase in productivity, has resulted in vastly increased populations. Also it increased the number of people engaged in devilment.

— Herbert Hoover