“It is generally characteristic of arms races, including human ones, that although all would be better off if none of them escalated, so long as one of them escalates none can afford not to.”
Source: The Blind Watchmaker (1986), Chapter 7 “Constructive Evolution” (p. 184)
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Richard Dawkins 322
English ethologist, evolutionary biologist and author 1941Related quotes

“Germ warfare against the United States would escalate to war against all humanity.”
Quoted in "The Second Attack on Pearl Harbor" - Page 201 - by Steve Horn - History - 2005.

An Address on Abraham Lincoln before the Republican Club of New York City (12 February 1909) http://web.archive.org/20050322051431/www.historycooperative.org/btw/Vol.10/html/35.html
Context: Of all forms of slavery there is none that is so harmful and degrading as that form of slavery which tempts one human being to hate another by reason of his race or color. One man cannot hold another man down in the ditch without remaining down in the ditch with him.
“Like a dance, conflict escalation generally requires the participation of both parties.”
George W. Bush and Osama bin Laden Are Dancing Together (2003)

Section 1 : Of The Different Species of Philosophy
An Enquiry Concerning Human Understanding (1748)
Context: Nature has pointed out a mixed kind of life as most suitable to the human race, and secretly admonished them to allow none of these biases to draw too much, so as to incapacitate them for other occupations and entertainments. Indulge your passion for science, says she, but let your science be human, and such as may have a direct reference to action and society. Abstruse thought and profound researches I prohibit, and will severely punish, by the pensive melancholy which they introduce, by the endless uncertainty in which they involve you, and by the cold reception which your pretended discoveries shall meet with, when communicated. Be a philosopher; but, amidst all your philosophy, be still a man.

The Evolutionary Future of Man (1993)

Widely attributed to Goethe, but also claimed to be a distortion of a passage by Haim Ginott.
Disputed

Wars I Have Seen (1945)