CCC 568
Profession of Faith›SECTION TWO I. THE CREEDS›CHAPTER TWO I BELIEVE IN JESUS CHRIST, THE ONLY SON OF GOD›Paragraph 3. THE MYSTERIES OF CHRIST'S LIFE
Christ's Transfiguration aims at strengthening the apostles' faith in anticipation of his Passion: the ascent on to the "high mountain" prepares for the ascent to Calvary. Christ, Head of the Church, manifests what his Body contains and radiates in the sacraments: "the hope of glory" ( Col 1:27; cf.: St. Leo the Great, Sermo 51, 3: PL 54, 310C).