251. How is Christian initiation brought about?
Christian initiation is accomplished by means of the sacraments which establish the foundations of Christian life. The faithful born anew by Baptism are strengthened by Confirmation and are then nourished by the Eucharist.
266. Why is this sacrament called Chrismation or Confirmation?
It is called Chrismation (in the Eastern Churches: Anointing with holy myron or chrism) because the essential rite of the sacrament is anointing with chrism. It is called Confirmation because it confirms and strengthens baptismal grace.
267. What is the essential rite of Confirmation?
The essential rite of Confirmation is the anointing with Sacred Chrism (oil mixed with balsam and consecrated by the bishop), which is done by the laying on of the hand of the minister who pronounces the sacramental words proper to the rite. In the West this anointing is done on the forehead of the baptized with the words, "Be sealed with the gift of the Holy Spirit". In the Eastern Churches of the Byzantine rite this anointing is also done on other parts of the body with the words, "The seal of the gift of the Holy Spirit".
268. What is the effect of Confirmation?
The effect of Confirmation is a special outpouring of the Holy Spirit like that of Pentecost. This outpouring impresses on the soul an indelible character and produces a growth in the grace of Baptism. It roots the recipient more deeply in divine sonship, binds him more firmly to Christ and to the Church and reinvigorates the gifts of the Holy Spirit in his soul. It gives a special strength to witness to the Christian faith.
269. Who can receive this sacrament?
Only those already baptized can and should receive this sacrament which can be received only once. To receive Confirmation efficaciously the candidate must be in the state of grace.
Also see the Catechism, Part 2, Section 2, Chapter 1, Article 2 (nn. 1285-1321)