The Apostle Paul is very clear that a sinner is justified by faith alone apart from works (Rom 3.28, Gal 2:16). He also says that we are justified by grace (Titus 3:7). When it comes to being justified by God, being declared righteous by him, it is not at all based on anything we’ve ever done. Instead, our justification is based on the works of Christ, which we receive by faith alone. His righteousness is imputed to us. We’re justified by his works! I like how Herman Witsius discussed this in light of the covenant of works and the covenant of grace:
The Scripture confirms this truth, when it sets the grace of Christ in diametrical opposition to our works, maintaining, that there can be no mixture of the one with the other. “If righteousness comes by the law,” saith the apostle, that is, if, by our works, we can acquire a right to life eternal, “then Christ is dead in vain,” Gal. 2:21. And more clearly, Rom. 11:6. “And if by grace, then it is no more of works; otherwise grace is no more grace. But if it be of works, then is it no more grace; otherwise work is no more work.”
In order clearly to discern the force of the apostle’s inference, it is to be observed, that there are but two ways by which we can come to the possession of salvation, according to the two covenants entered into between God and man: 1) either one has a right to life because he has fully satisfied the demand of the law, according to the covenant of works, and to him that thus “worketh is the reward reckoned of debt,” Rom. 4:4; 2) or he hath a right to life, because the surety of a better testament has made satisfaction for him, which of pure grace and most unmerited favor is imputed to him, who worketh not, in order to acquire that right, ver. 5, according to the covenant of grace.
As these covenants do in the whole essence of them differ, and in this respect are contradistinguished from, and set in opposition to each other, it is evident they conjoin inconsistencies, who would join together our works with the grace of God, our righteousness with the righteousness of Christ, in the matter of justification.
Witsius, H. (1837). The Economy of the Covenants between God and Man: Comprehending a Complete Body of Divinity. (W. Crookshank, Trans.) (Vol. 1, p. 369). London: T. Tegg & Son.
Covenant Presbyterian Church (OPC)
Hammond, WI, 54015