fire with fire

We must fight fire with fire. The fire of lust's pleasures must be fought with the fire of God's pleasures. If we try to fight the fire of lust with prohibitions and threats alone—even the terrible warnings of Jesus—we will fail. We must fight it with the massive promise of superior happiness. We must swallow up the little flicker of lust's pleasure in the configuration of holy satisfaction. — John Piper in Future Grace