And hence again it is, that they are said to be Godless, Christless, Spiritless, faithless, hopeless; without the covenant of grace, without strength; enemies in their minds by wicked works, and possessed by the spirit of wickedness, as a castle by a conqueror (Eph 2:12; Jude 19; 2 Thess 3:2; Col 1:21; Luke 11:21).
Now, these things being thus, it is impossible that all the men under heaven, that are unconverted, should be able to bring forth one work rightly good; even as impossible, as for all the briars and thorns under heaven to bring forth one cluster of grapes, or one bunch of figs; for indeed they want the qualification. A thorn bringeth not forth figs, because it wanteth the nature of the fig-tree; and so doth the bramble the nature of the vine. Good works must come from a good heart. Now, this the unbeliever wanteth, because he wanteth faith; for it is that which purifieth the heart (Luke 6:45; Acts 15:9). Good works must come from love to the Lord Jesus; but this the unbeliever wanteth also, because he wanteth faith: For faith 'worketh by love,' and by that means doth good (Gal 5:6).
And hence again it is, that though the carnal man doth never so much which he calleth good, yet it is rejected, slighted, and turned as dirt in his face again; his prayers are abominable (Prov 15:8), his ploughing is sin (Prov 21:4), and all his righteousness as menstruous rags (Isa 64:6).
Thus you see that without faith there are no good works.
Now then, to show you that they flow from faith: and that, For that FAITH is a principle of life, by which a Christian lives (Gal 2:19,20), a principle of motion, by which it walks towards heaven in the way of holiness (Rom 4:12; 2 Cor 5:7). It is also a principle of strength, by which the soul opposeth its lust, the devil, and this world, and overcomes them. 'This is the victory, even our faith' (1 John 5:4,5) Faith, in the heart of a Christian, is like the salt that was thrown into the corrupt fountain, that made the naughty waters good, and the barren land fruitful (2 Kings 2:19-22). Faith, when it is wrought in the heart, is like leaven hid in the meal, (Matt 13:33) or like perfume that lighteth upon stinking leather, turning the smell of the leather into the savour of the perfume; faith being then planted in the heart, and having its natural inclination to holiness. Hence it is that there followeth an alteration of the life and conversation, and so bringeth forth fruit accordingly. 'A good man out of the good treasure of his heart bringeth forth that which is good' (Luke 6:45). Which treasure, I say, is this faith (James 2:5; 1 Peter 1:7). And therefore it is that faith is called 'the faith according to godliness,' (Titus 1:1) and the 'most holy faith' (Jude 20).
Second, Good works must needs flow from faith, or no way; because that alone carrieth in it an argument sufficiently prevalent to win upon our natures, to make them comply with holiness.
Faith showeth us that God loveth us, that he forgiveth us our sins, that he accounteth us for his children, having freely justified us through the blood of his Son (Rom 3:24,25; 4; Heb 11:13; 1 Peter 1:8).
Faith receiveth the promise, embraceth it, and comforteth the soul unspeakably with it. Faith is so great an artist in arguing and reasoning with the soul, that it will bring over the hardest heart that it hath to deal with. It will bring to my remembrance at once, both my vileness against God, and his goodness towards me; it will show me, that though I deserve not to breathe in the air, yet that God will have me an heir of glory.
Now, there is no argument greater than this. This will make a man run through ten thousand difficulties, to answer God, though he never can, for the grace he hath bestowed on him.
Further, FAITH will show me how distinguishingly this love of God hath set itself upon me; it will show me, that though Esau was Jacob's brother, yet he loved Jacob (Mal 1:2). That though there were thousands more besides me that were as good as me, yet I must be the man that must be chosen.