This short story «What is your secret, Mr. Vandenburg» from the lecture «The Majestic Sense of Victory» was delivered by the Messenger Mark L. Prophet on Sunday, December 31, 1969, during “Class of the Golden Cycle”, at La Tourelle, Colorado Springs, Colorado. You can hear the entire lecture here: https://www.youtube.com/watch?v=QEwF65SqUTY&t=105s