Fourth, Faith layeth hold of that which is able to help the soul to bring forth good works: it layeth hold of, and engageth the strength of Christ, and by that overcometh that which oppresseth; 'I can do all things through Christ which strengtheneth me' (Phil 4:13).
In a word, a life of holiness and godliness in this world, doth so inseparably follow a principle of faith, that it is both monstrous and ridiculous to suppose the contrary. What, shall not he that hath life have motion! (Gal 2:20). He that hath by faith received the spirit of holiness, shall not he be holy? (Gal 3:2). and he that is called to glory and virtue, shall not he add to his faith virtue? (2 Peter 1:4,5). We are by faith made good trees, and shall not we bring forth good fruit? (Luke 6:43). They that believe are created in Christ Jesus unto good works; and God hath, before the world was, ordained that we should walk in them; and shall both our second creation, and God's foreordination be made frustrate? (Eph 1:4; 2:10). Besides, the children of faith are the children of light, and of the day (1 Thess 5:5). Lights upon a hill, and candles on a candlestick, and shall not they shine? They are the salt of the earth, shall not they be seasoning? (Matt 5:13-16).
The believer is the alone man, by whom God showeth to the world the power of his grace, the operation of his people's faith, &c. The unbelievers read indeed of the power of grace; of the faith, hope, love, joy, peace, and sanctification of the heart of the Christian; but they feel nothing of that sin-killing operation that is in these things; these are to them as a story of Rome or Spain. Wherefore to show them in others, what they find not in themselves, God worketh faith, hope, love, &c., in a generation that shall serve him; and by them they shall see what they cannot find in themselves; and by this means they shall be convinced, that though sin, and the pleasures of this life, be sweet to them, yet there is a people otherwise minded; even such a people, that do indeed see the glory of that which others read of, and from that sight take pleasure in those things which they are most averse unto. To this, I say, are Christians called; herein is God glorified; hereby are sinners convinced; and by this the world condemned (1 Thess 4:7; 1 Peter 2:12; 3:1; Heb 11:7).
Object. But if faith doth so naturally cause good works, what then is the reason that God's people find it so hard a matter to be fruitful in good works?
Answer
1. God's people are fruitful in good works according to the proportion of their faith; if they be slender in good works, it is because they are weak in faith. Little faith is like small candles, or weak fire, which though they shine and have heat; yet but dim shining and small heat, when compared with bigger candles and greater fire. The reason why Sardis had some in it whose works were not perfect before God, it was, because they did not hold fast by faith the word that they had formerly heard and received (Rev 3:1-3).
2. There may be a great mistake in our judging of our own fruitfulness. The soul that indeed is candid and right at heart, is taught by grace to judge itself, though fruitful, yet barren upon two accounts. (1.) When it compareth its life to the mercy bestowed upon it: for when a soul doth indeed consider the greatness and riches of the mercy bestowed upon it, then it must needs cry out, 'O wretched man that I am,' (Rom 7:24) for it seeth itself wonderfully to fall short of a conversation becoming one who hath received so great a benefit. (2.) It may also judge itself barren, because it falleth so far short of that it would attain unto, 'it cannot do the thing that it would' (Gal 5:17).
3. The heart of a Christian is naturally very barren; upon which, though the seed of grace, that is the fruitfullest of all seeds, be sown, yet the heart is naturally subject to bring forth weeds (Mat 15:19). Now, to have a good crop from such ground, doth argue the fruitfulness of the seed. Wherefore I conclude upon these three things, (1.) That the seed of faith is a very fruitful seed, in that it will be fruitful in so barren a soil. (2.) That faith is not beholden to the heart, but the heart to it, for all its fruitfulness. (3.) That therefore the way to be a more fruitful Christian, it is to be stronger in believing.
SECOND
Now for the second thing, to wit, That every one that believeth should be careful that their works be good. This followeth from what went just before; to wit, That the heart of a Christian is a heart subject to bring forth weeds.