The Wisdom of Wilhelm Stekel

On page 188 of The Catcher in the Rye, Mr. Antolini shares the following quote with Holden: "'The mark of the immature man is that he wants to die nobly for a cause, while the mark of the mature man is that he wants to live humbly for one.'" Say whether you agree or disagree with this definition of maturity, and give an example from real life that shows why you think this.