John Calvin on Romans 4:5

5. But believes on him, etc. This is a very important sentence, in which he expresses the substance and nature both of faith and of righteousness. He indeed clearly shews that faith brings us righteousness, not because it is a meritorious act, but because it obtains for us the favor of God. Some have stumbled at this sentence, — “his faith is counted for righteousness,” and have misapplied it, as though faith were in itself the cause of righteousness, and hence a meritorious act, and not the way and means of attaining righteousness. Condensed sentences will not submit to the rules of logic, but must be interpreted according to the context and explanations elsewhere found. “His faith” means, no doubt, his faith in the Promise, or in God who promises, or in him who, as is said in this verse, “justifies the ungodly:” hence what is believed, or the object of faith, is what is counted for righteousness. This accords with the declarations, — that “man is justified by faith,” Romans 3:28, and that “the righteousness of God” is “by faith,” Romans 3:22. If by faith, then faith itself is not that righteousness.

“Beware,” says Chalmers, “of having any such view of faith as will lead you to annex to it the kind of merit, or of claim, or of glorying under the gospel, which are annexed to works under the law. This, in fact, were just animating with a legal spirit the whole phraseology and doctrine of the gospel. It is God who justifies. He drew up the title-deed, and he bestowed the title-deed. It is ours simply to lay hold of it...Any other view of faith than that which excludes boasting must be altogether unscriptural.” — Ed. Nor does he declare only that God is the giver of righteousness, but he also arraigns us of unrighteousness, in order that the bounty of God may come to aid our necessity: in short, no one will seek the righteousness of faith except he who feels that he is ungodly; for this sentence is to be applied to what is said in this passage, — that faith adorns us with the righteousness of another, which it seeks as a gift from God. And here again, God is said to justify us when he freely forgives sinners, and favors those, with whom he might justly be angry, with his love, that is, when his mercy obliterates our unrighteousness.

Romans 4:6-8

6. Even as David also describeth the blessedness of the man, unto whom God imputeth righteousness without works,

6. Quemadmodum etiam David finit beatudinem hominis cui Deus imputat justitiam absque operibus,

7. Saying, Blessed are they whose iniquities are forgiven, and whose sins are covered.

7. Beati quorum remissæ sunt iniquitates, et quorum tecta sunt peccata:

8. Blessed is the man to whom the Lord will not impute sin.

8. Beatus vir, cui non imputavit Dominus peccatum.