There is no better test as to whether a man is really preaching the New Testament gospel of salvation than this, that some people might misunderstand it and misinterpret it to mean that it really amounts to this, that because you are saved by grace alone it does not matter at all what you do; you can go on sinning as much as you like because it will redound all the more to the glory of grace. That is a very good test of gospel preaching. If my preaching and presentation of the gospel of salvation does not expose it to that misunderstanding, then it is not the gospel…
I would say to all preachers: If your preaching of salvation has not been misunderstood in that way, then you had better examine your sermons again, and you had better make sure that you really are preaching the salvation that is offered in the New Testament to the ungodly, to the sinner, to those who are dead in trespasses and sins, and to those who are enemies of God. There is this kind of dangerous element about the true presentation of the gospel.
D. Martyn Lloyd-Jones (1899-1981)
Romans: The New Man, An Exposition of Chapter 6, Banner of Truth, 1972, 8-9