This righteousness is that which justifieth, and which secureth the soul from the curse of the law; by hiding, through its perfection, all the sins and imperfections of the soul. Hence it follows, “Even as David also describeth the blessedness of the man unto whom God imputeth righteousness without works, saying, Blessed are they whose iniquities are forgiven, and whose sins are covered. Blessed is the man to whom the Lord will not impute sin;” Rom. iv.
And this it doth, even while the person, that by grace is made a partaker, is without good works, and so ungodly. This is the righteousness of Christ, Christ’s personal performances, which he did when he was in this world; that is that by which the soul, while naked, is covered, and so hid as to its nakedness, from the divine sentence of the law: “I spread my skirt over thee, and covered thy nakedness,” Ezek. xvi. 4–9.
Now this obediential righteousness of Christ consisteth of two parts. 1. In a doing of that which the law commanded us to do. 2. In a paying that price for the transgression thereof, which justice hath said shall be required at the hand of man; and that is the cursed death. “In the day that thou eatest thereof, thou shalt surely die the death;” to wit, the death that comes by the curse of the law. So then, Christ having brought in that part of obedience for us, which consisteth in a doing of such obediential acts of righteousness which the law commands, he adds thereto the spilling of his blood, to be the price of our redemption from that cursed death, that by sin we had brought upon our bodies and souls. And thus are the Christians perfectly righteous; they have the whole obedience of Christ made over to them; to wit, that obedience that standeth in doing the law, and that obedience that standeth in paying of a price for our transgressions. So, then, doth the law call for righteousness? here it is. Doth the law call for satisfaction for our sins? Here it is. And what can the law say any more to the sinner but that which is good, when he findeth in the personal obedience of Christ for him, that which answereth to what it can command, that which it can demand of us?
Herein, then, standeth a Christian’s safety, not in a bundle of actions of his own, but in a righteousness which cometh to him by grace and gift; for this righteousness is such as comes by gift, by the gift of God. Hence it is called the gift of righteousness, the gift by grace, the gift of righteousness by grace, which is the righteousness of one, to wit, the obedience of Jesus Christ, Rom. v. 15–19.