Charm of Classical Humanity: Contemplation Before Rembrandt's Self-Portraits

In the history of painting, there is no artist who constantly depicts himself in life time except Rembrandt. As the scholars who study Rembrandt tested, there are almost 100 Rembrandt's self-portraits, among which 50 paintings are oil paintings. Why Rembrandt draw so many self-portraits? Besides that, Rembrandt have not left much writings for the whole life. There is little letters and biographies. And he does not have any family inheritors like Michelangelo does. All about him is presented through his paintings. And all about himself is revealed and presented through his self-portraits.