What? know ye not that your body is the temple of the Holy Ghost [which is] in you, which ye have of God, and ye are not your own? For ye are bought with a price: therefore glorify God in your body, and in your spirit, which are God’s. – 1Corinthians 6:19-20

Paul, who above all others, speaks most positively of salvation by grace, and is most clear upon the fact that salvation is not by the works of the law, is at the same time most intensely earnest for the holiness of Christians, and most zealously denounces those who would say, “Let us do evil, that good may come.” In this particular instance he sets the sin of fornication in the light of the Holy Spirit; he holds up, as it were, the seven-branched candlestick before it, and lets us see what a filthy thing it is. He tells us that the body is the temple of the Holy Ghost, and therefore ought not to be profaned; he declares that bodily unchastity is a sacrilegious desecration of our manhood, a violation of the sacred shrine wherein the Spirit takes up its dwelling-place; and then, as if this were not enough, he seizes the sin and drags it to the foot of the cross, and there nails it hand and foot, that it may die as a criminal; for these are his words: “Ye are not your own: for ye are bought with a price:” the price being the blood of Jesus. He finds no sharper weapon, no keener instrument of destruction than this. The redemption wrought on Calvary by the death of Jesus must be the death of this sin, and of all other sins, wherever the Spirit of God uses it as His sword of execution. Brethren and sisters, it is no slight thing to be holy. A man must not say, “I have faith,” and then fall into the sins of an unbeliever; for, after all, our outer life is the test of our inner life; and if the outer life be not purified, rest assured the heart is not changed. That faith which does not bring forth the fruit of holiness is the faith of devils. The devils believe and tremble. Let us never be content with a faith which can live in hell, but rise to that which will save us—the faith of God’s elect, which purifies the soul, casting down the power of evil, and setting up the throne of Jesus Christ, the throne of holiness within the spirit. ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/1004.cfm