Alter Christus   

As an alter Christus, the priest is profoundly united to the Word of the Father who, in becoming incarnate took the form of a servant, he became a servant (Phil 2: 5-11). The priest is a servant of Christ, in the sense that his existence, configured to Christ ontologically, acquires an essentially relational character: he is in Christ, for Christ and with Christ, at the service of humankind. Because he belongs to Christ, the priest is radically at the service of all people: he is the minister of their salvation, their happiness and their authentic liberation, developing, in this gradual assumption of Christ's will, in prayer, in "being heart to heart" with him. Therefore this is the indispensable condition for every proclamation, which entails participation in the sacramental offering of the Eucharist and docile obedience to the Church. 

Benedict XVI 06/24/2009