The sacrament of anointing of the sick confers special grace through prayer and anointing with oil to Christians who are suffering from grave illness or exhaustion of old age. It is celebrated through a liturgy by a priest or bishop and can confer forgiveness of sins, restoration of health if it aids salvation, preparation for eternal life, and reduction of temporal punishment due to sin for those properly disposed. The sacrament is intended for those with life-threatening or grave illness, about to undergo surgery for serious illness, of advanced age, or whose fatal illness has become more serious.