One of our fan-coloring biographers, who paints small men as very great, inquired of me lately with real affection too, whether he might consider as authentic, the change of my religion much spoken of in some circles. Now this supposed that they knew what had been my religion before, taking for it the word of their priests, whom I certainly never made the confidants of my creed. My answer was "say nothing of my religion. It is known to my God and myself alone. Its evidence before the world is to be sought in my life; if that has been honest and dutiful to society, the religion which has regulated it cannot be a bad one."

Letter to John Adams (11 January 1817), published in The Works of Thomas Jefferson in Twelve Volumes, Federal Edition, Paul Leicester Ford, ed., New York: G. P. Putnam's Sons, 1904, Vol. 12, pp. 48–49.