President Truman Speech on Atomic Energy President Harry S. Truman delivers speech regarding atomic energy at rally: "All mankind now stands in the doorway to destruction or upon the threshold upon the greatest age in history & I prefer to face that great age. Only a high moral standard can master this new power of the universe & develop it for the common good. When the sages & the scientists, the philosophers & the statesmen have all exhausted their studies of atomic energy, one solution & only one solution will remain. The substitution of decency & reason & brotherhood for the rule of force in the government of man."