Catechism of the Catholic Church

The special grace of the sacrament of the Anointing of the Sick has as its effects: - the uniting of the sick person to the passion of Christ, for his own good and that of the whole Church; - the strengthening, peace, and courage to endure in a Christian manner the sufferings of illness or old age; - the forgiveness of sins, if the sick person was not able to obtain it through the sacrament of Penance; - the restoration of health, if it is conducive to the salvation of his soul; - the preparation for passing over to eternal life.