A young man, just beginning the study of musical composition, once went to Mozart and asked him the formula for developing the theme of a symphony. Mozart suggested that a symphony was rather an ambitious project for a beginner: perhaps the young man might better try his hand at something simpler first. "But you were writing symphonies when you were my age." the student protested. "Yes, but I didn't have to ask how."
Source: Three Minutes by James Keller, M. M., 1950
Contributed by: Zaady