Just as Baptism gives new life, Eucharist nourishes life, and Reconciliation restores life when it is broken, Confirmation strengthens that life by the gifts of the Holy Spirit (cf. CCC 1285). It is about strengthening what God has given, and continues to give, to his sons and daughters (cf. CCC 1302-1303).
The Sacrament of Confirmation is not a rite of passage, nor a graduation from religion class, nor a ratification of a personal faith choice. Rather, it’s all about what God is doing for his beloved daughters and sons.
Why was a slap on the cheek by the confirming bishop part of the celebration of the Sacrament of Confirmation?
A part of the theology of the sacrament is that one takes on more adult responsibilities for the faith and becomes a “soldier for Christ” when confirmed. Any good soldier must be willing to suffer the bruises and scars of battle. The slap on the cheek was a symbolic gesture intended to remind us of the fact that we may have to endure suffering for our faith. The Sacrament of Confirmation strengthens us making us willing to accept those responsibilities and, if necessary, suffer and die for the faith.
What role does the Holy Spirit play in the Sacrament of Confirmation?
In the Sacrament of Confirmation, the Holy Spirit completes the grace of baptism and offers the newly confirmed strength as a true witness of Christ. Thus, the newly confirmed is “more strictly obliged to spread and defend the faith by word and deed” (cf. CCC, 1285). Thus, the Holy Spirit completes what was begun at baptism.