Second, It is sinful, because it is wrought by sinful flesh; for all legal righteousness is a work of the flesh. (Rom 4:1, Phil 3:3-8)

A work, I say, of the flesh; even of that flesh, who, or which also committeth the greatest enormities. For the flesh is but one, though its workings are divers: Sometimes in a way most notoriously sensual and devilish, causing the soul to wallow in wickedness as the sow doth to wallow in the mire.

But these are not all the works of the flesh; the flesh sometimes will attempt to be righteous, and set upon doing actions, that in their perfection would be very glorious and beautiful to behold. But because the law is only commanding words, and yieldeth no help to the man that attempts to perform it; and because the flesh is weak, and cannot do of itself that which it beginneth to meddle with, therefore this most glorious work of the flesh faileth.

But, I say, as it is a work of the flesh, it cannot be good, forasmuch as the hand that worketh it, is defiled with sin: For in a good man, one spiritually good, "that is in his flesh there dwells no good thing," but consequently that which is bad; how then can the flesh of a carnal, graceless man, and such a one is every Pharisee and self-righteous man in the world, produce, though it joineth itself to the law, to the righteous law of God, that which is good in his sight.

If any shall think that I pinch so hardly, because I call man's righteousness which is of the law, of the righteous law of God, flesh; let them consider that which follows; to wit, That though man by sin, is said to be dead in sin and trespasses, yet not so dead, but that he can act still in his own sphere. That is, to do, and choose to do, either that which by all men is counted base, or that which by some is counted good, though he is not, nor can all the world make him capable of doing anything that may please his God.

Man by nature, as dead as he is, can, and that with the will of his flesh, will his own salvation. Man by nature can, and that by the power of the flesh, pursue and follow after his own salvation; but then he wills it, and pursues or follows after it, not in God's way, but his own. Not by faith in Christ, but by the law of Moses, see Romans 10:16, 31, 10:3-7.

Wherefore it is no error to say, that a man naturally has Will, and a Power to pursue his will, and that as to his salvation. But it is a damnable error to say, that he hath will and power to pursue it, and that in God's way. For then we must hold that the mysteries of the gospel are natural; for that natural men, or men by nature, may apprehend and know them; yea, and know them to be the only means by which they must obtain eternal life: for the understanding must act before the will; yea, a man must approve of the way to life by Jesus Christ, before his mind will budge, or stir, or move that way: "But the natural man receiveth not the things of the Spirit of God; [of the gospel] for they are foolishness unto him, neither can he know them because they are spiritually discerned." (1 Cor 2:14)

He receiveth not these things; that is, his mind and will lie cross unto them, for he counts them foolishness; nor can all the natural wisdom in the world, cause that his will should fall in with them, because it cannot discern them.

Nature discerneth the law, and the righteousness thereof; yea, it discerneth it, and approveth thereof; that is, that the righteousness of it is the best and only way to life, and therefore the natural will and power of the flesh, as here you see in the Pharisee, do steer their course by that for eternal life. (1 Cor 2:14)

The righteousness of the law therefore is a work of the flesh, a work of sinful flesh, and therefore must needs be as filth and dung, and abominable as to that for which this man hath produced it, and presented it in the temple before God.