Thomas Boston (d. 1732) was a preacher-theologian who clearly preached and taught the gospel truth that a sinner is justified through faith alone apart from works. God justifies a sinner only by grace, and faith is a God-given instrument that receives God’s free gift of Christ’s righteousness. In a sermon on Ephesians 1:6, Boston noted that grace is “love and favor freely flowing, without anything in the object to draw it out.”
Later in the sermon Boston explained the way a sinner is accepted by God:
“First, It is “freely.” There is nothing in the sinner himself to procure it, or move God to it (Rom. 3:24), but as the sun shines without hire on the dung-hill, so God accepts sinners of mere grace.”
How is it free?
“It is without respect to any work done by the sinner (Titus 3:5). Grace and works are inconsistent in this matter. Men may render themselves acceptable to men, by some work of theirs, that is profitable or pleasant to them; but no work of ours can render us acceptable to God. It is natural for men to think to gain acceptance with God, by their doing better; and when they have set themselves to do and work for that end, they please themselves that they are accepted. But mistake it not, that way of acceptance is blocked up.”
This is true because:
(1.) All works of ours are excluded from our justification, whereof our acceptance is a part (Rom. 3:20), and faith and works are opposed in that matter (v. 28; Gal. 2:16).
(2.) Our best works are attended with sinful imperfections (Isa. 64:6), and mixed with many evil works (Jam. 3:2). So in them there is ground for God’s loathing and condemning us; how then can we be accepted for what is in itself loathsome and condemnable?
(3.) We can do no good works before we be accepted (John 9:31; Heb. 11:6). The tree must be good, ere [before] the fruit can be so. The person out of Christ can work no works, but dead works (John 15:5), for he is, while so, in the gall of bitterness, and in the bond of iniquity. And what is all that the man can do before he believe and be accepted in Christ, but a parcel of hypocritical works?
You can read this entire excellent sermon in Thomas Boston, The Whole Works of Thomas Boston: Discourses on Prayer, ed. Samuel M‘Millan, vol. 11 (Aberdeen: George and Robert King, 1852), 162.
Covenant Presbyterian Church (OPC)