Catechism of the Catholic Church

949 In the primitive community of Jerusalem, the disciples "devoted themselves to the apostles' teaching and fellowship, to the breaking of the bread and the prayers." ⁴⁸²

Communion in the faith. The faith of the faithful is the faith of the Church, received from the apostles. Faith is a treasure of life which is enriched by being shared.

950 Communion of the sacraments. "The fruit of all the sacraments belongs to all the faithful. All the sacraments are sacred links uniting the faithful with one another and binding them to Jesus Christ, and above all Baptism, the gate by which we enter into the Church. The communion of saints must be understood as the communion of the sacraments.... The name 'communion' can be applied to all of them, for they unite us to God.... But this name is better suited to the Eucharist than to any other, because it is primarily the Eucharist that brings this communion about." ⁴⁸³

951 Communion of charisms. Within the communion of the Church, the Holy Spirit "distributes special graces among the faithful of every rank" for the building up of the Church. ⁴⁸⁴ Now, "to each is given the manifestation of the Spirit for the common good." ⁴⁸⁵

952 "They had everything in common." ⁴⁸⁶ "Everything the true Christian has is to be regarded as a good possessed in common with everyone else. All Christians should be ready and eager to come to the help of the needy . . . and of their neighbors in want." ⁴⁸⁷ A Christian is a steward of the Lord's goods. ⁴⁸⁸

953 Communion in charity. In the sanctorum communio, "None of us lives to himself, and none of us dies to himself." ⁴⁸⁹ "If one member suffers, all suffer together; if one member is honored, all rejoice together. Now you are the body of Christ and individually members of it." ⁴⁹⁰ "Charity does not insist on its own way." ⁴⁹¹ In this solidarity with all men, living or dead, which is founded on the communion of saints, the least of our acts done in charity redounds to the profit of all. Every sin harms this communion.