Duty is the sublimest word in our language. Do your duty in all things. You cannot do more. You should never wish to do less.

Letter purportedly written to his son, G. W. Custis Lee (5 April 1852); published in The New York Sun (26 November 1864). Although the “Duty Letter” was presumed authentic for many decades and included in many biographies of Lee, it was repudiated in December 1864 by “a source entitled to know.” This repudiation was rediscovered by University of Virginia law professor Charles A. Graves who verified that the letter was inconsistent with Lee's biographical facts and letter-writing style. Lee's son also wrote to Graves that he did not recall ever receiving such a letter. “The Forged Letter of General Robert E. Lee”, Proceedings of the 26th annual meeting of the Virginia State Bar Association 17:176 (1914)