The principal fight of the Christian is with the world, the flesh, and the devil. These are their never-dying foes. These are the against whom the Christian must wage war. Unless they get the victory over these three, all other victories are useless and vain. If they had a nature like an angel, and were not a fallen creature, the warfare would not be so essential. But with a corrupt heart, a busy devil, and an ensnaring world, the Christian must either fight or be lost.