Some books against Deism fell into my hands … It happened that they wrought an effect on me quite contrary to what was intended by them; the arguments of the Deists, which were quoted to be refuted, appeared to me much stronger than the refutations; in short, I soon became a Deist.
Autobiography
As to Jesus of Nazareth, my Opinion of whom you particularly desire, I think the System of Morals and his Religion, as he left them to us, the best the World ever saw or is likely to see …
letter to Ezra Stiles, March 9, 1790