69 The priest is the same, Jesus Christ, whose sacred Person His minister represents. Now the minister, by reason of the sacerdotal consecration which he has received, is made like to the High Priest and possesses the power of performing actions in virtue of Christ's very person. Wherefore in his priestly activity he in a certain manner "lends his tongue, and gives his hand" to Christ.
Source: Mediator Dei (Vatican.va)