In Christ, and through his human will, the will of the Father has been perfectly fulfilled once for all. Jesus said on entering into this world: "Lo, I have come to do your will, O God." Only Jesus can say: "I always do what is pleasing to him." In the prayer of his agony, he consents totally to this will: "not my will, but yours be done." For this reason Jesus "gave himself for our sins to deliver us from the present evil age, according to the will of our God and Father." "and by that will we have been sanctified through the offering of the body of Jesus Christ once for all."
Source: Catechism of the Catholic Church (Vatican.va)