Which American said, "If you let your head get too big, it'll break your neck"?

The quote ("If you let your head get too big, it'll break your neck") is one that is attributed to Elvis Presley. He was born on January 8, 1935, Tupelo, Mississippi and died on August 16, 1977, Memphis, Tennessee. He was an American popular singer widely known as the “King of Rock and Roll” and one of rock music’s dominant musical performers from the mid-1950s until his death.

With the quote often used by Presley, he said that it's intended to make people aware that 'everybody needs to have confidence'. "But at some point there must be a limit". He then asked people to think about someone that they knew who was always telling others about everything great they had or had done. Elvis said, "These occurrences get old pretty quick. They happen as a results of the person having a big head, and it quickly alienates most or all the others around the offending person. Eventually, it seems that the alienation gets very bad and hard/impossible to reverse. What others want to hear is how or why someone is good at something, or how a person can help them out by using their expertise. So instead of talking the talk, one must help others out and walk the walk." A head too big should never be allowed!