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.
And this is the righteousness by which he that doth righteousness is righteous as he is righteous; because it is the very self-same righteousness that the Son of God hath accomplished by himself. Nor has he any other or more excellent righteousness, of which the law taketh notice, or that it requireth, than this: for as for the righteousness of his Godhead, the law is not concerned with that; for as he is such, the law is his creature, and servant, and may not meddle with him.
The righteousness also of his human nature, the law hath nothing to do with that; for that is the workmanship of God, and is as good, as pure, as holy, and undefiled, as is the law itself. All then that the law hath to do with, is to exact complete obedience of him that is made under it, and a due satisfaction for the breach thereof; the which, if it hath, then Moses is content.
Now, this is the righteousness with which the Christian, as to justification, is made righteous; to wit, a righteousness that is neither essential to his Godhead, nor to his manhood; but such as standeth in that glorious person (who was such) his obedience to the law. Which righteousness himself had, with reference to himself, no need of at all, for his Godhead, yea, his manhood, was perfectly righteous without it. This righteousness therefore was there, and there only necessary, where Christ was considered as God’s servant (and our surety) to bring to God Jacob again, and to restore the preserved of Israel. For though Christ was a Son, yet he became a servant to do, not for himself, for he had no need, but for us, the whole law, and so bring in everlasting righteousness for us.
And hence it is said, that Christ did what he did for us. He became the end of the law for righteousness for us; he suffered for us, he died for us, he laid down his life for us, and he gave himself for us. The righteousness then that Christ did fulfil, when he was in the world, was not for himself simply considered, nor for himself personally considered, for he had no need thereof; but it was for the elect, the members of his body.
Christ then did not fulfil the law for himself, for he had no need thereof. Christ again did fulfil the law for himself, for he had need of the righteousness thereof; he had need thereof for the covering of his body, and the several members thereof; for they, in a good sense, are himself, members of his body, of his flesh, and of his bones; and he owns them as parts of himself in many places of the holy scriptures; Eph. v. 30; Acts ix. 4, 5; Matt. xxv. 45; x. 40; Mark ix. 37; Luke x. 16; 1 Cor. xii. 12, 27. This righteousness then, even the whole of what Christ did in answer to the law, it was for us; and God hath put it upon them, and they were righteous in it, even righteous as he is righteous. And this they have before they do acts of righteousness.