from John Owen’s The Mortification of Sin, Chapter 3. Not the greatest passage from the book… hopefully there will be better quotes from Owen later.
“Men are galled with the sin that hath prevailed over them; they instantly promise to themselves and to God that they will do so no more; they watch over themselves and pray for a season, until this heat waxes cold, and the sense of sin is worn off; and so mortification goes also, and the sin returns to its former dominion. Duties [i.e. spiritual disciplines] are excellent for a healthy soul; they are no physic for a sick soul. He that turns his meat into medicine must expect no great operation. Spiritually sick people can not sweat our this distemper with working. But this is the way of men who deceive their own souls”