To be justified in the sight of God, to be Justified by faith or by works. A man is said to be justified in the sight of God when in the judgment of God he is deemed righteous, and is accepted on account of his righteousness…Thus we simply interpret justification, as the acceptance with which God receives us into his favor as if we were righteous; and we say that this justification consists in the forgiveness of sins and the imputation of the righteousness of Christ.
John Calvin (1509–64), Institutes 3.11.2.