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.
Nor is the Pharisee alone entangled in this mischief; many souls are by these works of the flesh flattered, as also the Pharisee was, into an opinion, that their state is good, when there is nothing in it. the most that their conversion amounteth to, is, the Publican is become a Pharisee; the open sinner is become a self-righteous man. Of the black side of the flesh he hath had enough, now therefore with the white side of the flesh he will recreate himself. And now, most wicked must he needs be, that questioneth the goodness of the state of such a man. He, of a drunkard, a swearer, an unclean person, a sabbath-breaker, a liar, and the like, is become reformed; a lover of righteousness, a strict observer, doer, and trader in the formalities of the law, and a herder with men of his complexion. And now he is become a great exclaimer against sin and sinners, defying to acquaint with those that once were his companions, saying, "I am not even as this Publican."
To turn therefore from the flesh to the flesh, from sin to man's righteousness: yea, to rejoice in confidence, that thy state is better than is that of the Publican: I mean, better in the eyes of divine justice, and in the judgment of the law; and yet to be found by the law, not in the spirit, but in the flesh; not in Christ, but under the law; not in a state of salvation, but of damnation, is common among men: For they, and they only, are the right men, "which worship God in the Spirit, and rejoice in Christ Jesus, and have no confidence in the flesh." Where by flesh, must not be meant the horrible transgressions against the law, though they are also called the works of the flesh (Gal 5:19), for they minister no occasion unto men, to have confidence in them towards God: but that is that, which is insinuated by Paul, where he saith, he had "no confidence in the flesh," though he might have had it, as he said, "Though I might also have confidence in the flesh. If any other man," saith he, "thinketh that he hath whereof he might trust in the flesh, I more" (Phil 3:3,4): And then he repeats a two-fold privilege that he had by the flesh. First, That he was one of the seed of Abraham, and of the tribe of Benjamin, an Hebrew of the Hebrews, &c.
Secondly, That he had fallen in with the strictest men of that religion, which was such after the flesh; to wit, to be a Pharisee, and was the son of a Pharisee, had much fleshly zeal for God, and was "touching the righteousness which is in the law blameless." (Phil 3:6)
But, I say still, there is nothing but flesh, flesh; fleshly privileges, and fleshly righteousness, and so consequently a fleshly confidence, and trust for heaven. This is manifest for these very things, when the man had his eyes enlightened, he counted all but loss and dung, that he might be found in Christ, not having his own righteousness which is of the law, but that which is through the faith of Christ, the righteousness which is of God by faith.
[Godly men are afraid of their own righteousness.]