Ambose on the office of the ministry:
Do not consider the merits of individuals, but the office of the priests. Or, if you look at 'the merits, consider the priest as Elijah. Look upon the merits of Peter also, or of Paul, who handed down to us this mystery which they had received of the Lord Jesus. To those [of old] a visible fire was sent that they might believe; for us who believe, the Lord works invisibly; for them that happened for a figure, for us for warning. Believe, then, that the Lord Jesus is present at the invocation of the priest, Who said: "Where two or three are, there am I also." How much where the Church is, and where His Mysteries are, does He vouchsafe to impart His presence!
On the Mysteries, V,27.