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 to be 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 (1 Peter 2:21); he died for us (1 Thess 5:10); he laid down his life for us (1 John 3:16), and he gave himself for us. (Gal 1:4) 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 scripture. (Eph 5:30, Acts 9:4,5, Matt 25:45, 10:40, Mark 9:37, Luke 10:16, 1 Cor 12:12,27) This righteousness then, even the whole of what Christ did in answer to the law, it was for his, and God hath put it upon them, and they are righteous in it, even righteous as he is righteous. And this they have before they do acts of righteousness.
II. There is righteousness put into them, before they act righteous things. A righteousness, I say, put into them; or I had rather that you should call it a principle of righteousness; for it is a principle of life to righteousness. Before man's conversion, there is in him a principle of death by sin; but when he is converted to Christ, there is put into him a principle of righteousness, that he may bring forth fruit unto God. (Rom 7:4-6)
Hence they are said to be quickened, to be made alive, to be risen from death to life, to have the Spirit of God dwelling in them; not only to make their souls alive, but to quicken their mortal bodies to that which is good. (Rom 8:11)
Here, as I hinted before, they that do righteousness are said to be born of him, that is, antecedent to their doing of righteousness (1 John 2:29), "born of him," that is, made alive with new spiritual and heavenly life. Wherefore the exhortation to them is, "Neither yield ye your members as instruments of unrighteousness unto sin: but yield yourselves unto God, as those that are alive from the dead, and your members as instruments of righteousness unto God." (Rom 6:13)
Now this principle must also be in men, before they can do that which is spiritually and gospelly good: For whatever seeming good thing any man doth, before he has bestowed upon him this heavenly principle from God, it is accounted nothing, it is accounted sin and abomination in the sight of God; for an evil tree cannot bring forth good fruit: Men do not gather grapes of thorns; neither of a bramble gather they figs. Either make the tree good and his fruit good, or the tree evil and his fruit evil. (Luke 6:43-45) It is not the fruit that makes the tree, but the tree that makes the fruit. A man must be good, before he can do good, and evil before he can do evil.
They be not righteous actions that make a righteous man; nor be they evil actions that make a wicked man: for a tree must be a sweeting tree before it yield sweetings;23 and a crab tree before it bring forth crabs.24