Now faith is the substance of things hoped for, the evidence of things not seen….By faith… – Hebrews 11

Faith is the great force which is needed by those whose principal work is to overcome sin. When God began with many of us, He found us very low down beneath the flood of evil. It may be that an awful temper broke over us in surging waves. We have to rise superior to it. Possibly He found us plunged in the great deeps of an evil habit. Was it drunkenness? Was it gambling? What was it? It had to be left beneath; we were called to rise out of it. Some are permitted to sink a long way down in sin; and when God begins with them, they have a desperate ascent even to reach common morality; what must the conflict be before they attain to spirituality and holiness? It is hard for those to rise to the surface who have been plunged in the deeps. If a man has been sunk down in black waters full of filth, a thousand fathoms deep, and if he has been long imprisoned in dark caves where no light has come, what a wondrous power would that be which should raise him to the sunlight! The Spirit of God comes to many when they are in much the same condition; and what a work it is to bring up from the horrible midnight, and to give strength to rise out of the inky waters! I have seen many a soul wearying to ascend; receiving a little light, and a little more light, and a little more light; but yet far from being clear of the dark waters of iniquity. Dear struggler, you will never overcome sin except by faith in Jesus Christ. Trust Him! Trust in the precious blood: that is the great sin-killer. Trust His pierced hands to pierce the hands of your lusts. Trust His wounded side to smite through the heart of your evil desires. Your hope lies there: where Jesus died, where Jesus rose again, where Jesus has gone into the glory. You may resolve to overcome a sin, and, perhaps, any one sin you may conquer for a time; but sin itself, as a force, in all its armies, is never to be overcome, save through the blood of the Lamb. You will never be able to cut down this huge upas tree except with the axe of Christ’s atoning sacrifice. Take that, and every blow will tell, but no other instrument will avail. God strengthening you, you shall out of weakness be made strong to overcome sin, though it be backed by the world, the flesh, and the devil. Entrenched in your nature though your sins may be, you will drive out these Canaanites, and free your heart from their dominion. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2209.cfm