Catechism of the Catholic Church §606 — excerpt
The Son of God, who came down "from heaven, not to do (his) own will, but the will of him who sent (him)", said on coming into the world, "Lo, I have come to do your will, O God."
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.