Let us look at the theology of these schools a little more closely. But before we proceed, it is important to define clearly what we mean by the transcendence of God, for the term is often loosely used. A transcendent god is one who is absolutely above the world and above man’s knowledge, a god who is so far removed that man can have no dealings with him directly, nor can he deal directly with man or make his works manifest to man, save through an intermediary. Such essentially was Aristotle’s God, his First Cause. The opposite idea is that of the immanence of God, such as we have seen in the Stoic teachings, in which God is conceived of as existing in all things. Now it is evident that in any system of philosophy or theology which believes in a transcendent God, and yet regards the visible world, including man, as the creation of the divine, some provision must be made for a being or beings, mediary between the transcendent God and the world, which shall express God’s will and make God intelligible to man. If such a being or beings do not exist to serve as mediators between the world and God, then man can have no knowledge of the divine whatsoever, and God cannot express himself in the world. Now in Plato’s philosophy the transcendency of God was at least implicit, it was clearly defined in Aristotle’s thought, and the idea certainly belonged to the Jewish-Alexandrian thought of the last two centuries before the beginning of the Christian era. Philo sets forth the doctrine most plainly. According to him God is so far above all mortal things that he must be defined in a negative way. All that we can say of him is that he is pure being, incorporeal, invisible, without qualities, above all virtue, and above all knowledge. We therefore cannot say that God is good or beautiful, because he is above all beauty and goodness; he is eternal, unchanging, existing in and for himself alone. His perfection is beyond our power to comprehend; our intellect cannot grasp his nature. All that man can know or say of God is that God _is_.[244] Yet naturally Philo is not content with negative definitions, but does attempt to express in a more or less traditional fashion the perfection of God; he speaks of him as that being which includes all reality within himself, or as the only being of whom real existence can be predicated; again as the absolute happy and perfect being; or as the original of all beauty. He likewise pictures God as the source of all activity, as the being to whom endless activity is as proper as it is for fire to burn or snow to chill; God is therefore the cause of all the activity in the world, as he is the supreme cause of all things.