I shall carry with me to the grave the most grateful recollections of your kind consideration and your name and fame will always be dear to me. Save for defense of my native state, I never desire again to draw my sword.
Source, in full
Letter to General Winfield Scott (20 April 1861) after turning down an offer by Abraham Lincoln of supreme command of the U.S. Army; as quoted in Personal Reminiscences, Anecdotes, and Letters of Gen. Robert E. Lee (1875) by John William Jones, p. 139