The, first flows from the practically necessary condition of adequacy of one's duration to the complete fulfillment of the moral law; the second, from the necessary presupposition of independence from the world of sense and of the ability to determine one's will according to the law of an intelligible world,.e., the law of freedom; the third, from the necessity of the condition for such an intelligible world, in order for it to be the highest good, through the presupposition of the highest self depende good,.e., the existence of God.