“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 Harvey8

English physician 1578–1657

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“Truth gains more even by the errors of one who, with due study and preparation, thinks for himself, than by the true opinions of those who only hold them because they do not suffer themselves to think.”

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“It is they [men of science] who hold the secret of the mysterious property of the mind by which error ministers to truth, and truth slowly but irrevocably prevails. Theirs is the logic of discovery, the demonstration of the advance of knowledge and the development of ideas, which, as the earthly wants and the passions of men remain almost unchanged, are the charter of progress, and the vital spark of history.”

John Dalberg-Acton, 1st Baron Acton (1834–1902) British politician and historian

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“If you can’t show that it’s true, then you can’t call it truth. Knowledge is similar to truth in that it a justified belief. Knowledge is demonstrable and testable with measurable accuracy. If you can’t demonstrate your knowledge to any degree at all by any means whatsoever then you don’t actually know what you think you do, no matter how convinced of it you are. Without evidentiary support, then it is only an empty assertion unworthy of serious consideration.”

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“Wasn’t that their natural right, to know the truth so as to be able to let the truth lead them to do good or evil, as they chose?”

Orson Scott Card (1951) American science fiction novelist

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“We never have a full demonstration, although there is always an underlying reason for the truth, even if it is only perfectly understood by God, who alone penetrated the infinite series in one stroke of the mind.”

Gottfried Leibniz (1646–1716) German mathematician and philosopher

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

“Those who assert that the mathematical sciences say nothing of the beautiful or the good are in error. For these sciences say and prove a great deal about them; if they do not expressly mention them, but prove attributes which are their results or definitions, it is not true that they tell us nothing about them. The chief forms of beauty are order and symmetry and definiteness, which the mathematical sciences demonstrate in a special degree.”

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“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.”

Thomas Jefferson (1743–1826) 3rd President of the United States of America

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 <br class="br">1810s <br class="br">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.

“Is Error, though unwittingly supported by a host of good men, stronger than Truth? Are Right and Wrong convertible terms, dependant upon popular opinion?”

William Lloyd Garrison (1805–1879) American journalist

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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.

“Neither force, nor argument, nor opinion," said Merlyn with the deepest sincerity, "are thinking. Argument is only a display of mental force, a sort of fencing with points in order to gain a victory, not for truth. Opinions are the blind alleys of lazy or of stupid men, who are unable to think. If ever a true politician really thinks a subject out dispassionately, even Homo stultus will be compelled to accept his findings in the end. Opinion can never stand beside truth. At present, however, Homo impoliticus is content either to argue with opinions or to fight with his fists, instead of waiting for the truth in his head. It will take a million years, before the mass of men can be called political animals.”

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“Rules necessary for demonstrations. To prove all propositions, and to employ nothing for their proof but axioms fully evident of themselves, or propositions already demonstrated or admitted; Never to take advantage of the ambiguity of terms by failing mentally to substitute definitions that restrict or explain them.”

Blaise Pascal (1623–1662) French mathematician, physicist, inventor, writer, and Christian philosopher

The Art of Persuasion

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William Harvey8

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