They go astray still more grievously as to the remission of sins; for as it is well known, they obtrude their own satisfactions, and thus seek to expiate the sins of men by their own merits, as though the sacrifice of Christ was not sufficient for that purpose. Hence it is that they will not allow that we are gratuitously justified by faith; for they cannot be brought to acknowledge a free remission of sins; and except the remission of sins be gratuitous, we must confess that righteousness is not by faith alone, but also by merits. But the whole Scripture proves that expiation is nowhere else to be sought, except through the sacrifice of Christ alone. This error, then, of the Papists is extremely gross and false. They further err in pleading for the merits of works; for they boast of their own inventions, the works of supererogation, or as they call them, satisfactions. And these meritorious works, under the Papacy, are gross errors and worthless superstitions, and yet they toil in them and lacerate themselves, nay, they almost wear out themselves. If they mutter many short prayers, if they run to altars and to various churches, if they buy masses, in a word, if they accumulate all these fictitious acts of worship, they think that they merit righteousness before God. Thus they forget their own saying, that righteousness is by covenant; for if it be by covenant, it is certain that God does not promise it to fictitious works, which men of themselves invent and contrive. It then follows, that what men bring to God, devised by themselves, cannot do anything towards the attainment of righteousness.