CCC 772

It is in the Church that Christ fulfills and reveals his own mystery as the purpose of God's plan: "to unite all things in him."¹⁸⁹ Eph 1:10. St. Paul calls the nuptial union of Christ and the Church "a great mystery." Because she is united to Christ as to her bridegroom, she becomes a mystery in her turn.¹⁹⁰ Eph 5:32; 3:9-11; 5:25-27. Contemplating this mystery in her, Paul exclaims: "Christ in you, the hope of glory."¹⁹¹ Col 1:27.