Source: Dictionary of Burning Words of Brilliant Writers (1895), p. 32.
“In the New Testament there is internal evidence that parts of it have proceeded from an extraordinary man; and that other parts are of the fabric of very inferior minds. It is as easy to separate those parts, as to pick out diamonds from dunghills.”
Letter to John Adams, on Christian scriptures (24 January 1814)
1810s
Context: The whole history of these books is so defective and doubtful that it seems vain to attempt minute enquiry into it: and such tricks have been played with their text, and with the texts of other books relating to them, that we have a right, from that cause, to entertain much doubt what parts of them are genuine. In the New Testament there is internal evidence that parts of it have proceeded from an extraordinary man; and that other parts are of the fabric of very inferior minds. It is as easy to separate those parts, as to pick out diamonds from dunghills.
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Thomas Jefferson 456
3rd President of the United States of America 1743–1826Related quotes
Introduction
The Common Background of Greek and Hebrew Civilizations (1965 [1962])
Context: The customs of both the Greeks and Hebrews in that heroic age were often alien to their respective descendants in the classical periods. We shall have to bear in mind that the gulf separating classical Israel (of the great Prophets) from classical Greece (of the scientists and philosophers) must not be read back into the heroic age when both peoples formed part of the same international complex.
“One social evil for which the New Testament is clearly in part responsible is anti-Semitism.”
Steve Allen on the Bible, Religion, and Morality (1990)

Source: Holism and Evolution (1926), p. 342

Letter to William Short (31 October 1819), published in The Works of Thomas Jefferson in Twelve Volumes http://oll.libertyfund.org/ToC/0054.php, Federal Edition, Paul Leicester Ford, ed., New York: G. P. Putnam's Sons, 1904, Vol. 12 http://oll.libertyfund.org/Texts/Jefferson0136/Works/0054-12_Bk.pdf, pp. 141–142
1810s
Context: The greatest of all the reformers of the depraved religion of his own country, was Jesus of Nazareth. Abstracting what is really his from the rubbish in which it is buried, easily distinguished by its lustre from the dross of his biographers, and as separable from that as the diamond from the dunghill. … The establishment of the innocent and genuine character of this benevolent moralist, and the rescuing it from the imputation of imposture, which has resulted from artificial systems, [footnote: e. g. The immaculate conception of Jesus, his deification, the creation of the world by him, his miraculous powers, his resurrection and visible ascension, his corporeal presence in the Eucharist, the Trinity; original sin, atonement, regeneration, election, orders of Hierarchy, etc. —T. J. ] invented by ultra-Christian sects, unauthorized by a single word ever uttered by him, is a most desirable object, and one to which Priestley has successfully devoted his labors and learning. It would in time, it is to be hoped, effect a quiet euthanasia of the heresies of bigotry and fanaticism which have so long triumphed over human reason, and so generally and deeply afflicted mankind; but this work is to be begun by winnowing the grain from the chaff of the historians of his life.
"Romano Drom" in Dreams Underfoot : The Newford Collection (2003), p. 118

As quoted in "Mevlana Jalal al-Din Rumi" http://en.mfethullahgulen.com/content/view/1820/49/ by Fethullah Gülen in The Fountain #24 (July-September 2004)
Variant translation: I want a heart which is split, chamber by chamber, by the pain of separation from God, so that I might explain my longings and desires to it.