“No servant can serve two masters; for either he will hate the one and love the other, or else he will be loyal to the one and despise the other. You cannot serve God and mammon.” – Luke 16:13

When the Lord Jesus Christ saves a sinner from the punishment of sin, He also saves him from the love of sin; He makes him holy as well as makes him happy and safe. The same lesson is taught in our Lord’s parables. For instance, there was no rejoicing over the lost sheep while it was still wandering away from the fold; the joy began when that lost sheep was found, and was brought home on the shepherd’s shoulder. A more striking example is that of the prodigal son. There was no joy over him while he was in the far country, and no kiss for him from his father while he was feeding the swine. He must come back, he must say, “Father, I have sinned,” there must be the forsaking of his former evil ways, or else there could be no enjoyment of his father’s forgiveness. We must ever say, as plainly as we can possibly say it: If thou wilt keep thy sins, thou shalt go to hell; but if thou wouldst go to heaven, thou must part company with thy sins. He who would be married to Christ must first be divorced from sin. There is no possibility of walking in the way of the Lord and, at the same time, treading the pathway of evil. “No man can serve two masters.” No one can, at the same time, be a servant of the Saviour and a servant of Satan.

Besides, dear friends, our common sense tells us that it would be highly dangerous to society if men were to be pardoned, and yet were not to be renewed in character and life. If Christ should meet with a man, and say to him, “I forgive thee because of the precious blood I shed for thee on Calvary; go and be a drunkard still, go and be unchaste, go and be a thief,” this would be the way to undermine the very pillars of society, and, very soon, we should not be safe in our beds. If there were no laws, or if the laws had no system of punishment for the guilty, human society would cease to be endurable. He who ruleth all things righteously will never set up such a scheme as this. The Judge of all the earth must punish sin; He will by no means clear the guilty. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2797.cfm