“Natural selection—the dying out of the poorly equipped—goes on day in and day out, inexorable and automatic. It is as tireless, as inescapable, as entropy.”
Source: Beyond This Horizon (1948; originally serialized in 1942), Chapter 14, “—and beat him when he sneezes”, p. 134
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Robert A. Heinlein 557
American science fiction author 1907–1988Related quotes

Quoted in "Mussolini Orders Arrest Of Critics" - "New York Times" article - October 8, 1943.
Source: Missouri Senate leader Dave Schatz mulls entry into 2022 U.S. Senate race https://missouriindependent.com/briefs/missouri-senate-leader-dave-schatz-mulls-entry-into-2022-senate-race/ (1 April 2021)

Variant translation: It seemed incredible that this day, a day without warnings or omens, might be that of my implacable death.
The Garden of Forking Paths (1942), The Garden of Forking Paths
“There are two important days in a woman's life: the day she is born and the day she finds out why.”
Source: When Women Were Birds: Fifty-four Variations on Voice