CATECHISM OF THE CATHOLIC CHURCH
SECOND EDITION

Paragraphs 567–571

567 The kingdom of heaven was inaugurated on earth by Christ. "This kingdom shone out before men in the word, in the works and in the presence of Christ" (LG 5). The Church is the seed and beginning of this kingdom. Its keys are entrusted to Peter.
568 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).
569 Jesus went up to Jerusalem voluntarily, knowing well that there he would die a violent death because of the opposition of sinners (cf. Heb 12:3).
570 Jesus' entry into Jerusalem manifests the coming of the kingdom that the Messiah-King, welcomed into his city by children and the humble of heart, is going to accomplish by the Passover of his Death and Resurrection.
571 The Paschal mystery of Christ's cross and Resurrection stands at the center of the Good News that the apostles, and the Church following them, are to proclaim to the world. God's saving plan was accomplished "once for all" by the redemptive death of his Son Jesus Christ.