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.”
Pope Benedict XIV, Ex Quo Primum (# 61), March 1, 1756: “The first consideration is that the ceremonies of the Mosaic Law were abrogated by the coming of Christ and that they can no longer be observed without sin after the promulgation of the Gospel.”
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