“It is time for students of the evolutionary process, especially those who have been misquoted and used by the creationists, to state clearly that evolution is a fact, not theory, and that what is at issue within biology are questions of details of the process and the relative importance of different mechanisms of evolution. It is a fact that the earth, with liquid water, is more than 3.6 billion years old. It is a fact that cellular life has been around for at least half of that period and that organized multicellular life is at least 800 million years old. It is a fact that major life forms now on earth were not at all represented in the past. There were no birds or mammals 250 million years ago. It is a fact that major life forms of the past are no longer living. There used to be dinosaurs and Pithecanthropus, and there are none now. It is a fact that all living forms come from previous living forms. Therefore, all present forms of life arose from ancestral forms that were different. Birds arose from nonbirds and humans from nonhumans. No person who pretends to any understanding of the natural world can deny these facts any more than she or he can deny that the earth is round, rotates on its axis, and revolves around the sun. The controversies about evolution lie in the realm of the relative importance of various forces in molding evolution.”

The Development Hypothesis (1852)
Context: Those who cavalierly reject the Theory of Evolution, as not adequately supported by facts, seem quite to forget that their own theory is supported by no facts at all. Like the majority of men who are born to a given belief, they demand the most rigorous proof of any adverse belief, but assume that their own needs none.

Source: The Greatest Show on Earth: The Evidence for Evolution

Source: Organizational ecology, 1989, p. 19

The object of administrative study should be to discover, first, what government can properly and successfully do, and secondly, how it can do these proper things with the utmost possible efficiency and at the least possible cost both of money and of energy.
Source: "The Study of Administration." 1937, p. 29

Source: Why Evolution is True (2009), p. 192

Edwards v. Aguillard, 482 U.S. 578 (1987) (dissenting) http://www.belcherfoundation.org/edwards_v_aguillard_dissent.htm
Has been misleadingly quoted without Scalia's statements attributing the assertions to witness testimony paragraphs earlier, "Before summarizing the testimony of Senator Keith and his supporters, I wish to make clear that I by no means intend to endorse its accuracy... Senator Keith and his witnesses testified essentially as set forth in the following numbered paragraphs:", as in Michael Stone, " Scalia Commencement Speech Supports Young Earth Creationism http://www.patheos.com/blogs/progressivesecularhumanist/2015/06/scalia-commencement-speech-supports-young-earth-creationism/" (), Progressive Secular Humanist, Patheos.
Misattributed

Youtube, Other, Reason Rally Ra Rant https://www.youtube.com/watch?v=isrST6wOUJA (March 28, 2012)

An Old Chaos: Humanism and Flying Saucers (p. 78)
The Silence of Animals: On Progress and Other Modern Myths (2013)

1920s, Viereck interview (1929)