“Americans live with the certain knowledge that the source of their greatness has not yet been released.”

1850s, Latter-Day Pamphlets (1850), The Present Time (February 1, 1850)

Source: Ideas have Consequences (1948), p. 13.
Context: In the popular arena, one can tell … that the average man … imagines that an industrious acquisition of particulars will render him a man of knowledge. With what pathetic trust does he recite his facts! He has been told that knowledge is power, and knowledge consists of a great many small things.

As quoted in "Prescott triumphs on slippery slopes of syntax" by Simon Hoggart (10 June 2004); Hansard http://www.publications.parliament.uk/pa/cm200304/cmhansrd/vo040609/debtext/40609-03.htm#40609-03_sbhd3 rendered this as "The document was released in February. A great deal of fuss was made that it had not been given a public release, but it was released in February."

Preface
Lacon (1820)

"The Spanish Element in Our Nationality," http://www.bartleby.com/229/5004.html letter to the Philadelphia Press (20 July 1883), later published in The Complete Prose Works of Walt Whitman (1892), part V: November Boughs

An Humble Attempt To Promote Explicit Agreement And Visible Union Of God’s People In Extraordinary Prayer For The Revival Of Religion And The Advancement Of Christ’s Kingdom On Earth from Edwards, Jonathan, The works of Jonathan Edwards (Vol. 2, p. 278). Banner of Truth Trust, Edinburgh, 1974.

Private conversation regarding the death of George Lincoln Rockwell (1967), quoted in The Rise of David Duke (1994) by Tyler Bridges

The Ayodhya temple-mosque dispute: Focus on Muslim sources (1993)

Trumpism is here to stay: America’s neo-fascist fever dream has only just begun (2016)