The Presbyterian clergy are loudest; the most intolerant of all sects, the most tyrannical and ambitious ; ready at the word of the lawgiver, if such a word could be now obtained, to put the torch to the pile, and to rekindle in this virgin hemisphere, the flames in which their oracle Calvin consumed the poor Servetus, because he could not find in his Euclid the proposition which has demonstrated that three are one and one is three, nor subscribe to that of Calvin, that magistrates have a right to exterminate all heretics to Calvinistic Creed. They pant to re-establish, by law, that holy inquisition, which they can now only infuse into public opinion.
Ouch! That was from his letter to William Short, April 13, 1820. The entire letter is worth a read. Jefferson discusses how Jesus' "biographers" had corrupted his original message, Paul being the first "corruptor" of Jesus' messages. In one letter Jefferson talked about separating the "diamonds" from the "dunghill" in order to extract the truth from the corruption in the Bible. Here, he uses the phrase separating "the gold from the dross."
Among the sayings and discourses imputed to Him by His biographers, I find many passages of fine imagination, correct morality, and of the most lovely benevolence; and others, again, of so much ignorance, so much absurdity, so much untruth, charlatanism and imposture, as to pronounce it impossible that such contradictions should have proceeded from the same Being. I separate, therefore, the gold from the dross; restore to Him the former, and leave the latter to the stupidity of some, and roguery of others of His disciples. Of this band of dupes and impostors, Paul was the great Coryphaeus, and first corruptor of the doctrines of Jesus. These palpable interpolations and falsifications of His doctrines, led me to try to sift them apart. I found the work obvious and easy, and that His past composed the most beautiful morsel of morality which has been given to us by man.