Sin has an indwelling and captivating power, whereby it continually assaults the principle of spiritual life, beating down the Christian's defenses, battering his armor, routing his graces, wasting his conscience, destroying his peace, and at last bringing him into a woeful captivity unless it be mortified. Corruption does not lie dormant in the Christian: though it reigns not supreme (because of a principle of grace to oppose it), yet it molests and often prevails to a very considerable extent. Because of this, the Christian is called upon to wage a constant warfare against it: to "mortify" it, to struggle against its inclinations and deny its solicitations, to make no provision for it, to walk in the Spirit so that he fulfill not the lusts of the flesh.