J. C. Ryle on Indwelling Sin

In my reading this morning I came across this great paragraph on sin written by J. C. Ryle, the 19th century English pastor.

...I am convinced that the greatest proof of the extent and power of sin is the pertinacity with which it cleaves to man even after he is converted and has become the subject of the Holy Ghost's operation. To use the language of the Ninth Article, 'this infection of nature doth remain - yea, even in them that are regenerate.' So deeply planted are the roots of human corruption, that even after we are born again, renewed, 'washed, sanctified, justified,' and made living members of Christ, these roots remain alive in the bottom of our hearts, and, like the leprosy in the walls of the house, we never get rid of them until the earthly house of this tabernacle is dissolved. Sin, no doubt, in the believer's heart, has no longer dominion. It is checked, controlled, mortified, and crucified by the expulsive power of the new principle of grace. The life of a believer is a life of victory and not of failure. But the very struggles which go on within his bosom, the fight that he finds it needful to fight daily, the watchful jealousy which he is obliged to exercise over his inner man, the contest between the flesh and the spirit, the inward 'groanings' which no one knows but he who has experienced them - all, all testify to the same great truth, all show the enormous power and vitality of sin. Mighty indeed must that foe be who even when crucified is still alive! Happy is that believer who understands it, and while he rejoices in Christ Jesus has no confidence in the flesh; and while he says, 'Thanks be unto God who giveth us the victory,' never forgets to watch and pray lest he fall into temptation!

Ryle, Holiness, pg. 6