They might need a preparatory discourse on the text of 'prove all things, hold fast that which is good,' in order to unlearn the lesson that reason is an unlawful guide in religion. They might startle on being first awaked from the dreams of the night, but they would rub their eyes at once, and look the spectres boldly in the face.

Letter to Benjamin Waterhouse (19 July 1822), 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, p. 244.