Which statement best explains how an element of tolkien's life influenced the theme revealed in this passage?

“let’s have no more argument. i have chosen mr. baggins and that ought to be enough for all of you. if i say he is a burglar, a burglar he is, or will be when the time comes. there is a lot more in him than you guess, and a deal more than he has any idea of himself. you may (possibly) all live to me yet.”