“Where the environment is too soft and luxurious and no strife is required for survival, not only are weak strains and individuals allowed to survive and encouraged to breed but the strong types also grow fat mentally and physically.”
Page 20.
The Passing of the Great Race (1916)
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Madison Grant 25
American lawyer, eugenicist, and conservationist 1865–1937Related quotes

“Success breeds complacency. Complacency breeds failure. Only the paranoid survive.”
Attributed to Andrew S. Grove in: William J. Baumol et al (2007) Good Capitalism, Bad Capitalism, and the Economics of Growth. p. 228
New millennium
Source: Social Amnesia: A Critique of Conformist Psychology from Adler to Laing (1975), pp. 70-71

Darwinism:
That survivors survive.
Source: The Book of The Damned (1919), Ch. 3, part 1 at resologist.net

Source: Fallen Leaves (2014), Ch. 2 : On Youth

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!

Session 242, Page 22
The Early Sessions: Sessions 1-42, 1997, The Early Sessions: Book 6

1961, Address before the American Society of Newspaper Editors