“In men this blunder still you find,—
All think their little set mankind.”

Source: One is A Crowd: Reflections of An Individualist (1952), p. 34

Two Sermons (1853), Sermon II : Of the Position and Duty of a Minister.
Context: You and I may perish. Temptation which has been too strong for thousands of stronger men, may be too great for me; I may prove false to my own idea of religion and of duty; the gold of commerce may buy me, as it has bought richer men; the love of the praise of men may seduce me; or the fear of men may deter my coward voice, and I may be swept off in the earthquake, in the storm, or in the fire, and prove false to that still small voice. If it shall ever be so, still the great ideas which I have set forth, of man, of God, of religion, — they will endure, and one day will be "a flame in the heart of all mankind." To-day! why, my friends, eternity is all around to-day, and we can step but towards that. A truth of the mind, of the conscience, of the heart, of the soul, — it is the will of God; and the omnipotence of God is pledged for the achievement of that will. Eternity is the life-time of Truth.

Source: In Hospital (1908), p. 4

The Expelled (1946)

This is attributed to Lincoln in the 1960 film adaptation of Pollyanna. In reality, it was fabricated by screenwriter and director David Swift, who had to have thousands of lockets bearing the false inscription recalled after Disney began selling them at Disneyland.
Misattributed

"Stephen Hawking at 70: Exclusive interview" http://www.newscientist.com/article/mg21328460.500-stephen-hawking-at-70-exclusive-interview.html in New Scientist, (4 January 2012). In his comment that he "used to think that information was destroyed in black holes", he is referring to the black hole information paradox.

Borneo Bulletin, 2 October 2009

Discourses on the Condition of the Great