"It must be explained to the faithful that the reception of the sacrament of Confirmation is necessary for the completion of baptismal grace. For "by the sacrament of Confirmation, [the baptized] are more perfectly bound to the Church and are enriched with a special strength of the Holy Spirit. Hence they are, as true witnesses of Christ, more strictly obliged to spread and defend the faith by word and deed." CCC 1285
The sacrament of Confirmation completes the sacrament of Baptism. If Baptism is the sacrament of re-birth to a new and supernatural life, Confirmation is the sacrament of maturity and coming of age. The real confession of Christ consist in this 'that the whole man submits himself to Truth, in the judgment of his understanding, in the submission of his will and in the consecration of his whole power of love. To do this, poor-spirited man is only able when he has been confirmed by God's grace'
This confirmation in the power of the Holy Spirit leading to a firm profession of faith has always been the particular effect which Catholic tradition has ascribed to the sacrament. It is effect which complements and completes that of Baptism.
THE CHURCH TEACHES
Confirmation is a true sacrament instituted by Christ and different from Baptism. It is administered by laying-on of hands and anointing with chrism accompanied by prayer. The chrism is blessed by the bishop and the bishop administers the sacrament. All baptized persons can and should be confirmed. The effect of the sacrament of Confirmation is to give strength in faith and for the confession of faith and to impress an indelible character.