The Catholic faith is necessary for attaining salvation - Dogma

Spirituality

St. Thomas Aquinas, Summa Theologiae, I-II, Q. 88, A. 5, Reply 1: “With regard to drunkenness we reply that it is a mortal sin by reason of its genus; for, that a man, without necessity, and through the mere lust of wine, makes himself unable to use his reason, whereby he is directed to God and avoids committing many sins, is expressly contrary to virtue.”