Those who would practice magic must be scrupulously honest in their personal lives. In one sense, magic works on the principle that 'it is so because I say it is so.' For words to take on such force, you must be deeply and completely convinced that it is identified with truth as you know it. To a person who practices honesty and keeps commitments, 'As I will, so mote it be' is not just a pretty phrase; it is a statement of fact.