“Baptism, the Eucharist, and the sacrament of Confirmation together constitute the “sacraments of Christian initiation, whose unity must be safeguarded. It must be explained to the faithful that the reception of the sacrament of Confirmation is necessary for the completion of baptismal grace.”
In the sacrament of confirmation the apostles and the bishops, who are successors, hand on to the baptized the special gift of the Holy Spirit, promised by Christ the Lord and poured out upon the apostles at Pentecost. Thus the initiation in the Christian life is completed so that believers are strengthened by power from heaven, made true witnesses of Christ in word and deed, and bound more closely to the Church.
Those who have been baptized continue on a path of Christian Initiation through the sacrament of confirmation. In this sacrament they receive the Holy Spirit whom the Lord sent upon the apostles on Pentecost.
This giving of the Holy Spirit conforms believers more fully to Christ and strengthens them so that they may bear witness to Christ for the building up of his Body in faith and love. They are so marked with the character or seal of the Lord that the sacrament of confirmation cannot be repeated. (The Rites of the Church, page 479.)
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