Our corruptions must be mortified or they will be raging and violent in the time of temptation, and like a torrent, sweep away all your convictions and resolutions. It is unmortified sin within that makes the heart like gunpowder; when the sparks of temptation fly about it (and they fall thick in a time of suffering), they but touch and explode.Flavel, John. Preparations for Sufferings: Chapter 12