Jerome 

“God justifies by faith alone.” (Deus ex sola fide justificat). (In Epistolam Ad Romanos, Caput X, v. 3, PL 30:692D.)

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“He who with all his spirit has placed his faith in Christ, even if he die in sin, shall by his faith live forever.” (Jacques Le Goff, The Birth of Purgatory, trans. Arthur Goldhammer (Chicago, Illinois: The University of Chicago Press, 1984), p. 61.)