We were to look backwards, not forwards, for improvement ... This was the real ground of all the attacks on you.
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Source, in full
Letter to Dr. Joseph Priestley (21 March 1801); published in The Life of Thomas Jefferson (1871) by Henry Stephens Randall, Vol. 2, p. 644; this seems to be the source of a misleading abbreviation: "[Christianity is] the most ... perverted system that ever shone on man".