http://www.worldfuturefund.org/wffmaster/Reading/Religion/Jefferson.htm
CHRISTIANITY VS. LIBERTY
"In every country and in every age, the priest has been hostile to liberty. He is always in alliance with the despot, abetting his abuses in return for protection to his own."
Source: Letter of Thomas Jefferson to Horatio G. Spafford, March 17, 1814.
"History, I believe, furnishes no example of a priest-ridden people maintaining a free civil government. This marks the lowest grade of ignorance of which their civil as well as religious leaders will always avail themselves for their own purposes."
Source: Letter of Thomas Jefferson to Alexander von Humboldt, Dec. 6, 1813.
"The advocate of religious freedom is to expect neither peace nor forgiveness from [the clergy]."
Source: Letter of Thomas Jefferson to Levi Lincoln, 1802.
"The clergy, by getting themselves established by law and in-grafted into the machine of government, have been a very formidable engine against the civil and religious rights of man."
Source: Letter of Thomas Jefferson to Jeremiah Moor, 1800.
Another source:
https://www.nobeliefs.com/jefferson.htm
In every country and in every age, the priest has been hostile to liberty. He is always in alliance with the despot, abetting his abuses in return for protection to his own.
-Thomas Jefferson, letter to Horatio G. Spafford, March 17, 1814
If we did a good act merely from love of God and a belief that it is pleasing to Him, whence arises the morality of the Atheist? ...Their virtue, then, must have had some other foundation than the love of God.
-Thomas Jefferson, letter to Thomas Law, June 13, 1814