Mankind will never win lasting peace so long as men use their full resources only in tasks of war. While we are yet at peace, let us mobilize the potentialities, particularly the moral and spiritual potentialities, which we usually reserve for war.

In 1950 he worked alongside Richard Nixon to reduce the French influence in Vietnam as well as asking the United States to attempt to cooperate with the French in the aid of strengthening Diem's Army. He subsequently attended the United Nations General Assembly as a United States delegate in 1946 1947 and 1950. A central West Berlin road was (re-)named "John-Foster-Dulles-Allee" in 1959 in the presence of Christian Herter Dulles' successor as Secretary of State.

Secretary of State under President Dwight D. He was a significant figure in the early Cold War era advocating an aggressive stance against communism throughout the world.