Catechism in a Year
Wednesday, May 23, 2018
157. Who is the Head of this body?
Christ "is the Head of the body, the Church" (Colossians 1:18). The Church lives from him, in him and for him. Christ and the Church make up the "whole Christ" (Saint Augustine); "Head and members form, as it were, one and the same mystical person" (Saint Thomas Aquinas).
Further reading: CCC 792-795, 807
158. Why is the Church called the "Bride of Christ"?
She is called the "Bride of Christ" because the Lord himself called himself her "Spouse" (Mark 2:19). The Lord has loved the Church and has joined her to himself in an everlasting covenant. He has given himself up for her in order to purify her with his blood and "sanctify her" (Ephesians 5:26), making her the fruitful mother of all the children of God. While the term "body" expresses the unity of the "head" with the members, the term "bride" emphasized the distinction of the two in their personal relationship.
Further reading: CCC 796, 808
These excerpts are from the Compendium of the CCC.