XXI. (98) But he says that the world perceptible to the outward senses is, as it were, the footstool of God on this account: first of all, that he may show that there is no efficient cause in the creatures; secondly, for the purpose of displaying that even the whole world has not a free and unrestrained spontaneous motion of its own, but God, the ruler of the universe, takes his stand upon it, regulating it and directing everything in a saving manner by the helm of his wisdom, using, in truth, neither hands nor feet, nor any other part whatever such as belongs to created objects; for God is not as man, but the reason why we at times represent him as such, for the sake of instruction, is because we are unable to advance out of ourselves, but derive our apprehension of the uncreate God from the circumstances with which we ourselves are surrounded. (99) And it is very beautifully said by Moses, in the form of a parable, when he speaks of the world as if it resembled a brick; for the world appears to stand and to be firmly fixed like a brick in a house, as far as the vision of the sight of the outward senses can inform us, but it has a very swift motion, and one which is able to outstrip all particular motions. (100) For the eyes of our body look upon the appearance of the sun by day and of the moon by night as standing still, and yet who is there who does not know that the rapidity of movements of these two bodies is incomparable, since they go round the whole heaven in one day? Thus, indeed, the universal heaven itself also, while appearing to stand still, revolves in a circle; its movements being detected and comprehended by the invisible and more divine eye which is placed in our mind.