“That it does not matter what a man believes is a statement heard on every side today. … What he believes tells him what the world is for. How can men who disagree about what the world is for agree about any of the minutiae of daily conduct? The statement really means that it does not matter what a man believes so long as he does not take his beliefs seriously.”
Source: Ideas have Consequences (1948), p. 23.
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Richard M. Weaver 110
American scholar 1910–1963Related quotes

If it does matter, then you must justify your beliefs; if it doesn’t, then you must justify belief itself.
Source: Faith vs. Fact (2015), p. 63

Interview by FBI Senior Special Agent George L. Piro (7 February 2004); National Security Archive Electronic Briefing Book No. 279 http://www.gwu.edu/~nsarchiv/NSAEBB/NSAEBB279/index.htm.
Attributed

“Behavior is what a man does, not what he thinks, feels, or believes.”

Speech given on November 3, 1936. Quoted in Wir alle helfen dem Führer "Schicksal — ich glaube!" (Munich: Zentralverlag der NSDAP, 1937), pages 103-114
Source: Something More, A Consideration of the Vast, Undeveloped Resources of Life (1920), p. 31

“What a man knows hardly matters. It is what he does.”
Source: The Wizard