ARLINGTON, VA., April 20, 1861.
Since my interview with you on the 18th inst. I have felt that I ought no longer to retain my commission in the Army. I therefore tender my resignation, which I request you will recommend for acceptance. It would have been presented at once but for the struggle it has cost me to separate myself from a service to which I have devoted all the best years of my life and all the ability I possessed.
During the whole of that time — more than a quarter of a century — I have experienced nothing but kindness from my superiors, and the most cordial friendship from my comrades. To no one, General, have I been as much indebted as to yourself for uniform kindness and consideration, and it has always been my ardent desire to meet your approbation. I shall carry to the grave the most grateful recollections of your kind consideration, and your name and fame will always be dear to me.
Save in defense of my native State, I never desire again to draw my sword. Be pleased to accept my most earnest wishes for the continuance of your happiness and prosperity, and believe me,
Most truly yours,
R. E. LEE.
SOURCE: John William Jones, Life and Letters of Robert Edward Lee: Soldier and Man, p. 132-3