The Catechism in Questions & Answers

214. What is the connection between the activity of the Holy Spirit and the Apostle ministry?

The Apostles have been sent by Jesus Christ. Through them He offers mankind redemption. They exercise their ministry in the power of the Holy Spirit. This also has its effect in the dispensation of the sacraments, in the proclamation of the forgiveness of sins, and in the spread of the gospel, as well as in keeping alive the promise of Christ’s return. It is in this manner that the bride of Christ is prepared for the return of Jesus Christ.

Bride of Christ (bridal congregation): see Questions 387., 555., 561. et seq.