Sin aims always at the utmost; every time it rises up to tempt or entice, might it have its own course, it would go out to the utmost sin in that kind. Every unclean thought or glance would be adultery if it could; every covetous desire would be oppression, every thought of unbelief would be atheism, might it grow to its head. Men may come to that, that sin may not be heard speaking a scandalous word in their hearts,—that is, provoking to any great sin with scandal in its mouth; but yet every rise of lust, might it have its course, would come to the height of villany: it is like the grave, that is never satisfied.
– John Owen –
from The Mortification of Sin in Believers, volume 6 of Works, page 12