“He was a killer, a thing that preyed, living on the things that lived, unaided, alone, by virtue of his own strength and prowess, surviving triumphantly in a hostile environment where only the strong survive.”
Source: The Call of the Wild (1903)
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Jack London 77
American author, journalist, and social activist 1876–1916Related quotes

"Stairway to Heaven," Thinking in Pictures (1995), p. 202.
Source: Thinking in Pictures: My Life with Autism
Context: Most people don't realize that the slaughter plant is much gentler than nature. Animals in the wild die from starvation, predators, or exposure. If I had a choice, I would rather go through a slaughter system than have my guts ripped out by coyotes or lions while I was still conscious. Unfortunately, most people never observe the natural cycle of birth and death. They do not realize that for one living thing to survive, another living thing must die.

“The foolish rush to end their lives.
Only the steadfast soul survives.”
Source: Lyric Poetry

Source: Memorandum to Robert T. Hartmann https://www.fordlibrarymuseum.gov/library/document/0204/1511691.pdf (1976)

Source: The Fall of America: Poems of These States 1965-1971

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