The priesthood leads one to serve God in a state which, in itself, is no better or worse than any other: it is simply different. But the priestly vocation is invested with a dignity and greatness which has no equal on earth. Saint Catherine of Siena put these words on Jesus' lips: I do not wish the respect which priests should be given to be in any way diminished; for the reverence and respect which is shown them is not referred to them but to Me, by virtue of the Blood which I have given to them to administer. Were it not for this, you should render them the same reverence as lay people, and no more... You must not offend them; by offending them you offend Me and not them. Therefore I forbid it and I have laid it down that you shall not touch my Christs.
Some people keep searching for what they call the identity of the priest. How clearly Saint Catherine expresses it! What is the identity of the priest? That of Christ. All of us Christians can and should be not just other Christs, alter Christus, but Christ himself: ipse Christus! But in the priest this happens in a direct way, by virtue of the sacrament.