Statement to John Hill Brinton at the start of his Tennessee River Campaign, early 1862. "Personal Memoirs of John H. Brinton, Major and Surgeon U.S.V., 1861-1865". Book by John H. Brinton, p. 239, 1914.
Attributed in Patton (motion picture) (1970). This is sometimes said to have been uttered in a speech by Patton to the Sixth Armored Division of the Third Army, 31 May 1944, but documentation is lacking. The following poem appeared in the Bureau of Aeronautics Navy Department News Letter, 1 Jan. 1943: "The greatest duty of a sailor / Is duty from worries and cares, / Not to die for his country, / Make our enemies die for theirs!"
Speech in Ottawa on January 10, 1946. "Eisenhower Speaks: Dwight D. Eisenhower in His Messages and Speeches". Book edited by Rudolph L. Treuenfels, 1948.
Mark Twain (2014). “Mark Twain on Common Sense: Timeless Advice and Words of Wisdom from America's Most-Revered Humorist”, p.53, Skyhorse Publishing, Inc.