Augustine of Hippo

I do not know in what manner these people understand that the Ancient of Days appeared to Daniel, from whom the Son of man, which he deigned to be for our sakes, is understood to have received the kingdom; namely, from him who says to him in the Psalms, "You are my son; this day have I begotten you; ask of me, and I shall give you the nations for your inheritance" and who has "put all things under his feet." If, however, both the Father giving the kingdom and the Son receiving it appeared to Daniel in bodily form, how can those people say that the Father never appeared to the prophets, and, therefore, that he only ought to be understood to be invisible whom no one has seen or can see? For Daniel has told us thus.… Behold the Father giving and the Son receiving an eternal kingdom; and both are in the sight of him who prophesies, in a visible form.