“In past ages, the law governing the survival of the fittest roughly weeded out the less desirable strains. Then man's new sense of pity began to interfere with the ruthless workings of nature. … The only method compatible with our notions of civilization and the race is to prevent the breeding of the unfit by sterilization and the deliberate guidance of the mating instinct. … The trend of opinion among eugenists is that we must make marriage more difficult. Certainly no one who is not a desirable parent should be permitted to produce progeny. A century from now it will no more occur to a normal person to mate with a person eugenically unfit than to marry a habitual criminal.”
A Machine to End War (1937)
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Francis Escudero Twitter feed: @SayChiz (6:02 p.m. 2015 September 22).
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Source: The Pivot of Civilization, 1922, Chapter 8, "Dangers of Cradle Competition" (also quoted in Charles Valenza, "Was Margaret Sanger a Racist?" Family Planning Perspectives, January-February 1985, page 44.)

Source: Manhood of Humanity (1921), p. 136. Chapter: Capitalistic Era.
Context: Such as contribute most to human progress and human enlightenment — men like Gutenberg, Copernicus, Newton, Leibnitz, Watts, Franklin, Mendeleieff, Pasteur, Sklodowska-Curie, Edison, Steinmetz, Loeb, Dewey, Keyser, Whitehead, Russell, Poincaré, William Benjamin Smith, Gibbs, Einstein, and many others — consume no more bread than the simplest of their fellow mortals. Indeed such men are often in want. How many a genius has perished inarticulate because unable to stand the strain of social conditions where animal standards prevail and "survival of the fittest" means, not survival of the "fittest in time-binding capacity," but survival of the strongest in ruthlessness and guile — in space-binding competition!

Human Selection, Popular Science Monthly, volume 38 (November 1890) page 93.
(Misquoted in the article Evolution and You, in Awake! magazine, 8 August 1995).

1880s, Letter to Mary Gladstone (1881)