But God be thanked, that ye were the servants of sin, but ye have obeyed from the heart that form of doctrine which was delivered you. Being then made free from sin, ye became the servants of righteousness. – Romans 6:17,18

If we are ever to see a pure and godly (nation) we must have a gospelized (nation): if we are to put down drunkenness and the social evil, it must be by the proclamation of the grace of God. Men must be forgiven by grace, renewed by grace, transformed by grace, sanctified by grace, preserved by grace; and when that comes to pass the golden age will dawn; but while they are merely taught their duty, and left to do it of themselves in their own strength, it is labour in vain. You may flog a dead horse a long while before it will stir: you need to put life into it, for else all your flogging will fail. To teach men to walk who have no feet is poor work, and such is instruction in morals before grace gives a heart to love holiness. The gospel alone supplies men with motive and strength, and therefore it is to the gospel that we must look as the real reformer of men. The doctrine of grace, the whole plan of salvation by grace, is most promotive of holiness. Wherever it comes it helps us to say, “God forbid,” to the question, “Shall we sin, because we are not under the law, but under grace?” If God is good to the undeserving, some men will go into sin, but there are others of a nobler order whom the goodness of God leadeth to repentance. They scorn the beast-like argument-that the more loving God is, the more rebellious we may be, and they feel that, against a God of goodness, it is an evil thing to rebel. I have found men pleading against the doctrines of grace on the ground that they did not promote morality, to whom I could have justly replied, “What has morality to do with you, or you with it?” These sticklers for good works are not often the doers of them. ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/1735.cfm