The prophets of the Old Testament foretold that God's Spirit would rest upon the Messiah to sustain his mission. Their prophecy was fulfilled when Jesus the Messiah was conceived by the Spirit and born of the Virgin Mary. The Holy Spirit descended on Jesus on the occasion of his baptism by John. Jesus' entire mission occurred in communion with the Spirit. Before he died, Jesus promised that the Spirit would be given to the Apostles and to the entire Church. After his death, he was raised by the Father in the power of the Spirit. Confirmation deepens our baptismal life that calls us to be missionary witnesses of Jesus Christ in our families, neighborhoods, society, and the world. . . . We receive the message of faith in a deeper and more intensive manner with great emphasis given to the person of Jesus Christ, who asked the Father to give the Holy Spirit to the Church for building up the community in loving service.
The Church celebrates the outpouring of the Holy Spirit upon the baptized in the sacrament of confirmation. To be confirmed, baptized Catholics who have the use of reason must be suitably instructed, properly disposed, and be able to renew their baptismal promises.
Confirmation is not a completion of religious education nor a graduation from learning the faith, but an initiation into the fullness of the body of Christ, the Church. As confirmandi have received the fullness of the gifts of the Holy Spirit, these gifts are to be used to build of the Church by sharing the good news of Jesus Christ through words, deeds and actions faithfully lived out in one's life in accordance with the teachings of Christ.
In the Sacrament of Confirmation, the baptized person is "sealed with the gift of the Holy Spirit" and is strengthened for service to the Body of Christ.