5. The grace of God is very conspicuous in the justification of men before God, and acceptance with him; which, in the strongest terms, is said to be of grace, to be by “his grace”, the grace of God, and “freely” by his grace, and that through the redemption that is in Christ (Titus 3:7; Rom. 3:24). Free grace, by infinite wisdom, found out the way whereby sinful men might be just with God; which otherwise never could have been; namely, by not imputing their trespasses to them, but to Christ, the Surety free grace provided, whereby “God is just, and yet the justifier of him that believes in Jesus”, (2 Cor. 5:19; Rom. 3:25, 26) free grace appears in appointing Christ to work out, and bring in everlasting righteousness; and in sending him in the likeness of sinful flesh to do it, (Dan. 9:24; Rom. 8:3, 4) and it was free grace moved Christ to come to do this will of God, and “become the end of the law for righteousness”; and it was free grace in God the Father to accept of this righteousness, in the room and stead of sinners, and to impute it, without works, unto them, as their justifying righteousness; and in appointing faith to be the recipient of it, that so it might clearly appear to be of grace; as the persons who are justified by it, being in themselves ungodly, more clearly shows it, (Rom. 4:5, 6, 16). Justification is always denied to be of works; and the righteousness by which men are justified, is represented as a gift, a free gift, a gift by grace, as faith that receives it also is (Rom. 3:20, 28, 5:15-17; Eph. 2:8).
John Gill (1697 – 1771) A Body of Doctrinal Divinity Book 1, Chapter 13, The Grace of God