So one finds in the imagery of poets and in the theme of musicians. If you study one musician and his lifelong work you will find that his whole work is developed on a certain line as the basis of his work. Also by studying the biography of great people you will find how one thing has led to the other, different but of similar kind. Therefore it is natural that a thief in time becomes a greater thief; so the righteous after some time may become a saint.