As stated in the Catechism of the Catholic Church (CCC)
1285 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." (CCC)