A most interesting study of this subject can be made by studying the art of different ages and of different nations. Every nation has its typical lines and typical forms. Every period shows the peculiarity of expression of the art of that period. 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 another, 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.