Catechism of the Catholic Church

606 The Son of God, who came down "from heaven, not to do [his] own will, but the will of him who sent [him]", ⁴¹³ said on coming into the world, "Lo, I have come to do your will, O God." "And by that will we have been sanctified through the offering of the body of Jesus Christ once for all." ⁴¹⁴ From the first moment of his Incarnation the Son embraces the Father's plan of divine salvation in his redemptive mission: "My food is to do the will of him who sent me, and to accomplish his work." ⁴¹⁵ The sacrifice of Jesus "for the sins of the whole world" ⁴¹⁶ expresses his loving communion with the Father. "The Father loves me, because I lay down my life", said the Lord, "[for] I do as the Father has commanded me, so that the world may know that I love the Father." ⁴¹⁷

607 The desire to embrace his Father's plan of redeeming love inspired Jesus' whole life, ⁴¹⁸ for his redemptive passion was the very reason for his Incarnation. And so he asked, "And what shall I say? 'Father, save me from this hour'? No, for this purpose I have come to this hour." ⁴¹⁹ And again, "Shall I not drink the cup which the Father has given me?" ⁴²⁰ From the cross, just before "It is finished", he said, "I thirst." ⁴²¹