The Chrism Mass is a celebration of the priesthood of Jesus Christ. During the celebration, the Bishop and the priests renew their commitment to priestly service to the Bishop and to one another. It is also a time that the Bishop will consecrate the Chrism and bless the other sacred oils used by the Catholic Church during the year. Holy oils have been used in the Church for anointing since the second century. The symbolism of anointing with oils also signifies the presence of the Holy Spirit.
Chrism is a mixture of olive oil and balsam used for anointing the crown of the head after baptism.
By baptism Christians die with Christ, are buried with Him and rise with him. The Chrism is also used at the sacrament of confirmation, at the ordination of priests and bishops and the dedication of altars and churches. The Oil of Catechumens is composed of pure olive oil. It is used in the anointing of candidates preparing for baptism. The Oil of the Sick is pure olive oil used in the sacrament of the anointing of the sick.