Analysis of information sources in references of the Wikipedia article "Free grace theology" in English language version.
We hold fast to free grace—the view that God saves mankind by grace alone through faith alone in Jesus Christ alone. No works before, during, or after the moment of initial faith in Christ contribute anything to the free gift of forgiveness and eternal life that one receives through faith in Jesus Christ. The absence of good works during or after the moment of faith subtracts nothing from one's eternal position in Christ. However, good works determine whether one will receive eternal rewards.
As a strong advocate of Free Grace in the Brethren assemblies, Mackintosh was harshly censured by southern (U.S.) Presbyterian theologian Robert Dabney
There were Christians in good standing with the church c.AD 400 who held the doctrine that a person received salvation by faith alone without repentance or good works. Much to Augustine's ire, baptism was practiced immediately if one of them believed in Christ, without first entering prolonged education in Christian faith and morals as a catechumen. For those early Christians, God's future judgment consisted only of payment (reward) or punishment (temporary) for how those Christians lived their lives before God—heaven or hell was not in question.
Pseudo-Chrysostom (5th or 6th century AD) that proposed a similar interpretation of Matthew 5:19-20: But seeing that to break the least commandments and not to keep them are one and the same, why does He say above of him that breaks the commandments, that he shall be the least in the kingdom of heaven, and here of him who keeps them not, that he shall not enter into the kingdom of heaven? … For a man to be in the kingdom is not to reign with Christ, but only to be numbered among Christ's people; what He says then of him that breaks the commandments is, that he shall indeed be reckoned among Christians, yet the least of them.
During the final two decades of the twentieth century, certain dispensational theologians began to propagate the idea that one could be in a state of salvation and lack entirely the fruit of repentance from sin and obedience to Christ. Their particular form of soteriology came to be known as free grace–a title coined by Zane Hodges. Some of the other more well-known adherents of the Free Grace movement were Louis [sic] Sperry Chafer, Miles Stanford, and Norman Geisler. Hodges became a particularly well-known proponent of the Free Grace theology because of his 1981 book The Gospel under Siege.
But, say they, the Catholic Christians have Christ for a foundation, and they have not fallen away from union with Him, no matter how depraved a life they have built on this foundation, as wood, hay, stubble; and accordingly the well-directed faith by which Christ is their foundation will suffice to deliver them some time from the continuance of that fire, though it be with loss, since those things they have built on it shall be burned.