Bring thy lust to the gospel, not for relief, but for further conviction of its guilt: look on him whom thou hast pierced, and be in bitterness. Say to thy soul, What have I done? What love, what mercy, what blood, what grace, have I despised and trampled on! Is this the return I make to the Father for his love, to the Son for his blood, to the Holy Ghost for his grace? Do I thus requite the Lord? Have I defiled the heart that Christ died to wash, which the blesses Spirit hath chosen to dwell in? And can I keep myself out of the dust? What can I say to the dear Lord Jesus? How shall I hold up my head with any boldness before him? Do I account communion with him of so little value that for this vile lust’s sake I have scarce left him any room in my heart? How shall I escape, if I neglect so great salvation? In the mean time, what shall I say to the Lord? Love, mercy, grace, goodness, peace, joy, consolation; I have despised them all, and esteemed them as a thing of naught, that I might harbour a lust in my heart.

– John Owen –
from The Mortification of Sin