“The studious and good and true, never suffer their minds to be warped by the passions of hatred and envy, which unfit men duly to weigh the arguments that are advanced in behalf of truth, or to appreciate the proposition that is even fairly demonstrated. Neither do they think it unworthy of them to change their opinion if truth and undoubted demonstration require them to do so. They do not esteem it discreditable to desert error, though sanctioned by the highest antiquity, for they know full well that to err, to be deceived, is human; that many things are discovered by accident and that many may be learned indifferently from any quarter, by an old man from a youth, by a person of understanding from one of inferior capacity.”
"Dedication to Dr. Argent and Other Learned Physicians".
De Motu Cordis et Sanguinis (1628)
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William Harvey 8
English physician 1578–1657Related quotes

The Study of History (1895)

Patheos, The Cow http://www.patheos.com/blogs/reasonadvocates/2016/01/22/the-cow/ (January 22, 2016)

Source: The Tales of Alvin Maker, Red Prophet (1988), Chapter 17.

The Shorter Leibniz Texts (2006) http://books.google.com/books?id=oFoCY3xJ8nkC&dq edited by Lloyd H. Strickland, p. 111

Comment on establishing the University of Virginia, in a letter to Thomas Cooper (7 October 1814); published in The Writings of Thomas Jefferson (1905) edited by Andrew Adgate Lipscomb and Albert Ellery Bergh, Vol VII, p. 200 http://books.google.com/books?id=jrSgJGp-B64C&pg=RA1-PA200&dq=%22A+professorship+of+theology+should+have+no+place+in+our+institution%22&ei=u65FR562EpqCpwLkk9XxBg
1810s
Context: I agree … that a professorship of Theology should have no place in our institution. But we cannot always do what is absolutely best. Those with whom we act, entertaining different views, have the power and the right of carrying them into practice. Truth advances, and error recedes step by step only; and to do to our fellow men the most good in our power, we must lead where we can, follow where we cannot, and still go with them, watching always the favorable moment for helping them to another step.

Introductory Remarks
Thoughts on African Colonization (1832)
Context: Is Error, though unwittingly supported by a host of good men, stronger than Truth? Are Right and Wrong convertible terms, dependant upon popular opinion? Oh no! Then I will go forward in the strength of the Lord of Hosts — in the name of Truth — and under the banner of Right. As it is not by might nor by power, but by the Spirit of God, that great moral changes are effected, I am encouraged to fight valiantly in this good cause, believing that I shall "come off conqueror, and more than conqueror" — yet not I, but Truth and Justice. It is in such a contest that one shall chase a thousand, and two put ten thousand to flight.

The Art of Persuasion