Catechism of the Catholic Church §1520 — excerpt
A particular gift of the Holy Spirit. the first grace of this sacrament is one of strengthening, peace and courage to overcome the difficulties that go with the condition of serious illness or the frailty of old age.
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.
Whole chapters cited: James 515
Also cites: Council of Florence (1439): DS 1325 · Council of Trent (1551): DS 1717
