In a discussion thread https://www.lesswrong.com/posts/zsznamBgNuj3XX2DP/self-congratulatory-rationalism#2pmeNAZ33A8y43464 on LessWrong, March 2014
“I prefer rationalism to atheism. The question of God and other objects-of-faith are outside reason and play no part in rationalism, thus you don't have to waste your time in either attacking or defending.”
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Isaac Asimov 303
American writer and professor of biochemistry at Boston Uni… 1920–1992Related quotes
Source: The Nature and Authority of Scripture (1995), p. 25

Variant: The principle of bounded rationality [is] the capacity of the human mind for formulating and solving complex problems is very small compared with the size of the problems whose solution is required for objectively rational behavior in the real world — or even for a reasonable approximation to such objective rationality.
Source: 1940s-1950s, Administrative Behavior, 1947, p. 198.

Utopia and Violence (1947)
Context: There are many difficulties impeding the rapid spread of reasonableness. One of the main difficulties is that it always takes two to make a discussion reasonable. Each of the parties must be ready to learn from the other. You cannot have a rational discussion with a man who prefers shooting you to being convinced by you.

Emmett F. Fields, in "Atheism : An Affirmative View" (1980) http://www.infidels.org/library/modern/emmett_fields/affirmative_atheism.html
Misattributed

the necessary and sufficient conditions for rational knowledge
Source: Great Islamic Encyclopedia website, 2016 https://www.cgie.org.ir/fa/news/154958