Men in age do not usually persist in the pursuit of youthful lusts, although they have never mortified any one of them. And the same is the case of bartering of lusts, and leaving to serve one that a man may serve another. He that changes pride for worldliness, sensuality for Pharisaism, vanity in himself to the contempt of others, let him not think that he hath mortified the sin that he seems to have left. He hath changed his master, but is a servant still.
– John Owen –
from The Mortification of Sin in Believers, volume 6 of Works, page 26