They take Satan as a fictional charachter who
embodies certain ideals, he is the non-conformist, he is the rebel who fights for individual freedom apart from the idealized power structure put forth in the bible.
Beyond purely pictorial values, the basic rationalism of his method and the mood of
ideal calm in his paintings have
certain moral implications; they seem to
embody an underlying ethical belief in the rational principle which governs the world of artistic form and natural life.