There are two aspects of symbolic knowledge. One aspect is "nazul," when everything in nature begins to give its key to the artist in the form of a symbol. And by using the key, the artist becomes able to find out the mystery that every form represents. The other aspect is "uruj," in which a wave arises from the heart of the artist, bringing before his view a design by which he can best express his thought symbolically. The artist produces this wave that rises in his heart by his pain, satisfying thereby the demand of the spirit for perfection. In nazul, therefore, the artist receives the message; in uruj he gives it to the world, thereby fulfilling the spiritual act to which the inspired artist is destined.