Sometimes attributed to Contact (1985), but the quote does not appear in that book.
It appears attributed to Sagan in Judson Poling's 2003 book "Do Science and the Bible Conflict?", but without source.
Misattributed
Source: Via Google Books https://books.google.com/books?id=Ondv5WzhYYYC&pg=PA21&dq=Sagan
“It is not what the man of science believes that distinguishes him, but how and why he believes it. His beliefs are tentative, not dogmatic; they are based on evidence, not on authority or intuition.”
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Bertrand Russell 562
logician, one of the first analytic philosophers and politi… 1872–1970Related quotes
1950s, Unpopular Essays (1950)
Patheos, A Letter to a Certain Christian http://www.patheos.com/blogs/reasonadvocates/2013/10/12/a-letter-to-a-certain-christian/ (October 12, 2013)
Presidential campaign (April 12, 2015 – 2016), First presidential debate (September 26, 2016)
is generally a scientific one.
Source: 2010s, The Moral Landscape (2010), p. 143–144
Thomas Henry Huxley. "Lectures on Evolution Title: This is Essay# 3 from" Science and Hebrew Tradition." (1882); as cited in: William Trufant Foster, (1908) Argumentation and debating, p. 55
1880s
The History of Freedom in Antiquity (1877), p.3
1960s–1970s, Nobel Banquet Speech (1974)