Unspeakably solemn is it to see so many abusing this Divine perfection. They continue to despise God’s authority, trample upon His laws, continue in sin, and yet presume upon His mercy. But God will not be unjust to Himself. God shows mercy to the truly penitent, but not to the impenitent (Luke 13:3). To continue in sin and yet reckon upon Divine mercy remitting punishment is diabolical. It is saying, 'Let us do evil that good may come,' and of all such it is written, whose 'damnation is just' (Rom. 3:8).
A.W. Pink