Notes on The Epistle of St. Paul the Apostle to the Romans (Author Bishop Richard Challoner (ed.))
14:23 Discerneth: That is, distinguisheth between meats, and eateth against his conscience, what he deems unclean. Of faith. . .By faith is here understood judgment and conscience: to act against which is always a sin.
Original Douay-Rheims from Project Gutenberg - Massive cleanup of OCR problems and editing done locally.