Council of Trent: Session VI, Justification, Chapter XV

CHAPTER XV. That, by every mortal sin, grace is lost, but not faith.

In opposition also to the subtle wits of certain men, who, by pleasing speeches and good words, seduce the hearts of the innocent, it is to be maintained, that the received grace of Justification is lost, not only by infidelity whereby even faith itself is lost, but also by any other mortal sin whatever, though faith be not lost; thus defending the doctrine of the divine law, which excludes from the kingdom of God not only the unbelieving, but the faithful also (who are) fornicators, adulterers, effeminate, liers with mankind, thieves, covetous, drunkards, railers, extortioners, and all others who commit deadly sins; from which, with the help of divine grace, they can refrain, and on account of which they are separated from the grace of Christ.

Translation: J. Waterworth, The Canons and Decrees of the Council of Trent (1848), Hanover Historical Texts Project transcription (1995).