“Reason not with him, that will deny the principal truths!”
The Sayings of the Wise (1555)
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Pythagoras 121
ancient Greek mathematician and philosopher -585–-495 BCRelated quotes
"The Logic of Common Morality" http://web.archive.org/web/20060616233942/http://www.stephankinsella.com/texts/vandun_philosophy_argument.pdf, from E.M. Barth and J.L. Martens, eds., Argumentation Approaches to Theory Formation: Containing the contributions to the Groningen Conference on the Theory of Argumentation, October 1978 (Benjamins, 1982; original from the University of Michigan, digitized Mar 12, 2007. ISBN 9-027-23007-2, 333 pages).

Letter to Anthony Collins (29 October 1703) http://oll.libertyfund.org/titles/1726#lf0128-09_head_098

The Note Book of Elbert Hubbard (1927)

“Is it reasonable to assume a purposiveness in all the parts of nature and to deny it to the whole?”
Seventh Thesis
Idea for a Universal History from a Cosmopolitan Point of View (1784)

Thoughts Upon Slavery (1774)
Context: I deny that villany is ever necessary. It is impossible that it should ever be necessary for any reasonable creature to violate all the laws of justice, mercy, and truth. No circumstances can make it necessary for a man to burst in sunder all the ties of humanity. It can never be necessary for a rational being to sink himself below a brute. A man can be under no necessity of degrading himself into a wolf. The absurdity of the supposition is so glaring, that one would wonder any one can help seeing it.