There comes by the preaching of the word an apprehension upon the understandings of men that they are sinners, that such and such things are sins, that themselves are guilty of them; but this light is not powerful, nor doth it lay hold on the practical principles of the soul, so as to conform the mind and will unto them, to produce effects suitable to such an apprehension. And therefore it is that wise and knowing men, destitute of the Spirit, do not think those things to be sins at all wherein the chief movings and actings of lust do consist. It is the Spirit alone that can do, that doth, this work to the purpose. And this is the first thing that the Spirit doth in order to the mortification of any lust whatever,—it convinces the soul of all the evil of it, cuts off all its pleas, discovers all its deceits, stops all its evasions, answers its pretences, makes the soul own its abomination, and lie down under the sense of it. Unless this be done all that follows is in vain.
– John Owen –
from The Mortification of Sin in Believers, volume 6 of Works, pages 85-86