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

No sooner is this doctrine of grace set forth in a clear light than men begin to cavil at it. It is the target for all carnal logic to shoot at. Unrenewed minds never did like it, and they never will; it is so humbling to human pride, making so light of the nobility of human nature. That men are to be saved by divine charity, that they must as condemned criminals receive pardon by the exercise of the royal prerogative, or else perish in their sins, is a teaching which they cannot endure. God alone is exalted in the sovereignty of His mercy; and the sinner can do no better than meekly touch the silver scepter, and accept undeserved favour just because God wills to give it:-this is not pleasant to the great minds of our philosophers, and the broad phylacteries of our moralists, and therefore they turn aside, and fight against the empire of grace. Straightway the unrenewed man seeks out artillery with which to fight against the gospel of the grace of God, and one of the biggest guns he has ever brought to the front is the declaration that the doctrine of the grace of God must lead to licentiousness. If great sinners are freely saved, then men will more readily become great sinners; and if when God’s grace regenerates a man it abides with him, then men will infer that they may live as they like and yet be saved…They dare to assert that men will take license to be guilty because God is gracious, and they do not hesitate to say that if men are not to be saved by their works they will come to the conclusion that their conduct is a matter of indifference, and that they may as well sin that grace may abound. In part it is a great mistake, and in part it is a great lie. In part it is a mistake because it arises from misconception, and in part it is a lie because men know better or might know better if they pleased. Let legalists look to their own hands and tongues and leave the gospel of grace and its advocates to answer for themselves. ~ C.H. Spurgeon

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