shall ask them if one portion of matter is God, and the other part the world? But if they shall say of matter that it is made, it will undoubtedly follow that they confess Him whom they declare to be God to have been made!—a result which certainly neither their reason nor ours can admit. But they will say, God is invisible. And what will you do? If you say that He is invisible by nature, then neither ought He to be visible to the Saviour. Whereas, on the contrary, God, the Father of Christ, is said to be seen, because “he who sees the Son,” he says, “sees also the Father.”[197] This certainly would press us very hard, were the expression not understood by us more correctly of understanding, and not of seeing. For he who has understood the Son will understand the Father also. In this way, then, Moses too must be supposed to have seen God, not beholding Him with the bodily eye, but understanding Him with the vision of the heart and the perception of the mind, and that only in some degree. For it is manifest that He, viz., who gave answers to Moses, said, “You shall not see my face, but my hinder parts.”[198] These words are, of course, to be understood in that mystical sense which is befitting divine words, those old wives’ fables being rejected and despised which are invented by ignorant persons respecting the anterior and posterior parts of God. Let no one indeed suppose that we have indulged any feeling of impiety in saying that even to the Saviour the Father is not visible. Let him consider the distinction which we employ in dealing with heretics. For we have explained that it is one thing to see and to be seen, and another to know and to be known, or to understand and to be understood.[199] To see, then, and to be seen, is a property of bodies, which certainly will not be appropriately applied either to the Father, or to the Son, or to the Holy Spirit, in their mutual relations with one another. For the nature of the Trinity surpasses the measure of vision, granting to those who are in the body, _i.e._ to all other creatures, the property of vision in reference to one another. But to a nature that is incorporeal and for the most part intellectual, no other attribute is appropriate save that of knowing or being known, as the Saviour Himself declares when He says, “No man knoweth the Son, save the Father; nor does any one know the Father, save the Son, and he to whom the Son will reveal Him.”[200] It is clear, then, that He has not said, “No one has seen the Father, save the Son;” but, “No one knoweth the Father, save the Son.”