As she has done for the canon of Sacred Scripture and for the doctrine of the faith, the Church, by the power of the Spirit who guides her “into all truth,” has gradually recognized this treasure received from Christ and, as the faithful steward of God’s mysteries, has determined its “dispensation.” Thus the Church has discerned over the centuries that among liturgical celebrations there are seven that are, in the strict sense of the term, sacraments instituted by the Lord. (Catechism of the Catholic Church, 1117)

The sacraments are “of the Church” in the double sense that they are “by her” and “for her.” They are “by the Church,” for she is the sacrament of Christ’s action at work in her through the mission of the Holy Spirit. They are “for the Church” in the sense that “the sacraments make the Church,” since they manifest and communicate to men, above all in the Eucharist, the mystery of communion with the God who is love, One in three persons. (Catechism of the Catholic Church, 1118)