-- Lk 9:18-22
The Gospel according to St. Luke emphasizes the action of the Holy Spirit and the meaning of prayer in Christ's ministry. Jesus prays before the decisive moments of his mission: before his Father's witness to him during his baptism and Transfiguration, and before his own fulfillment of the Father's plan of love by his Passion. He also prays before the decisive moments involving the mission of his apostles: at his election and call of the Twelve, before Peter's confession of him as "the Christ of God," and again that the faith of the chief of the Apostles may not fail when tempted. Jesus' prayer before the events of salvation that the Father has asked him to fulfill is a humble and trusting commitment of his human will to the loving will of the Father.
-- CCC 2600