When God speaks peace, it guides and keeps the soul that it “turn not again to folly.” When we speak it ourselves, the heart is not taken off the evil; nay, it is the readiest course in the world to bring a soul into a trade of backsliding. If, upon thy plastering thyself, thou findest thyself rather animated to the battle again than utterly weaned from it, it is too palpable that thou hast been at work with thine own soul, but Jesus Christ and his Spirit were not there. Yea, and oftentimes nature having done its work, will, ere a few days are over, come for its reward; and, having been active in the work of healing, will be ready to reason for a new wounding. In God’s speaking peace there comes along so much sweetness, and such a discovery of his love, as is a strong obligation on the soul no more to deal perversely.
– John Owen –
from The Mortification of Sin in Believers, volume 6 of Works, page 76