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. 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.”

THE SIGNS AND THE RITE OF CONFIRMATION

In treating the rite of Confirmation, it is fitting to consider the sign of anointing and what it signifies and imprints: a spiritual seal.

Anointing, in Biblical and other ancient symbolism, is rich in meaning: oil is a sign of abundance and joy; it cleanses and limbers; oil is a sign of healing, since it is soothing to bruises and wounds; and it makes radiant with beauty, health, and strength.

By this anointing the confirmand receives the “mark,” the seal of the Holy Spirit. A seal is a symbol of a person, a sign of personal authority, or ownership of an object. Hence soldiers were marked with their leader’s seal and slaves with their master’s.

Christ himself declared that he was marked with his Father’s seal. Christians are also marked with a seal: “It is God who establishes us with you in Christ and has commissioned us; he has put his seal on us and given us his Spirit in our hearts as a guarantee.” This seal of the Holy Spirit marks our total belonging to Christ, our enrollment in his service for ever, as well as the promise of divine protection in the great eschatological trial.

THE EFFECTS OF CONFIRMATION

It is evident from its celebration that the effect of the sacrament of Confirmation is the special outpouring of the Holy Spirit as once granted to the apostles on the day of Pentecost.

From this fact, Confirmation brings an increase and deepening of baptismal grace:

• it roots us more deeply in the divine filiation which makes us cry, “Abba! Father!”;
• it unites us more firmly to Christ;
• it increases the gifts of the Holy Spirit in us;
• it renders our bond with the Church more perfect;
• it gives us a special strength of the Holy Spirit to spread and defend the faith by word and action as true witnesses of Christ, to confess the name of Christ boldly, and never to be ashamed of the Cross.

WHO CAN RECEIVE THIS SACRAMENT?

Every baptized person not yet confirmed can and should receive the sacrament of Confirmation. Since Baptism, Confirmation, and Eucharist form a unity, it follows that “the faithful are obliged to receive this sacrament at the appropriate time,” for without Confirmation and Eucharist, Baptism is certainly valid and efficacious, but Christian initiation remains incomplete.

A candidate for Confirmation who has attained the age of reason must profess the faith, be in the state of grace, have the intention of receiving the sacrament, and be prepared to assume the role of disciple and witness to Christ, both within the ecclesial community and in temporal affairs.

– Adapted from Catechism of the Catholic Church, more details here.