The church has an important role in warfare in terms of the application of Christ's work. As we think of it, we just have to put a few pieces in place before we get to the point of how we actually do that. The first thing that must be said, just as the basic foundation, is that anything we talk about in terms of our engaging with warfare, sin and evil, Satan himself, is only because of what Christ has done. He comes as the one who wins the war. He's the one who defeats sin. He's the one who defeats death and the Evil One. Now, by virtue of our relationship to him — so, as we are brought into faith union with him by the Spirit — we are transferred from the kingdom of the Evil One to the kingdom of the Son, already in us. Warfare has been won by Christ, and the power of the Evil One, his rule and domain over us, has been defeated. So that, in becoming Christians, there already is an engagement with the Evil One, in Christ, and all that he has done. Now, as we then live for him, as we then take the gospel to the nations, the gospel proclamation, as the Spirit of God takes what we say and applies it to people's lives, spiritual warfare is engaged so that, as people become believers, as the Spirit of God brings new life, as they are brought to faith union in Christ, sin and death is defeated in them. The Evil One's power over them is defeated. Habits that we have tied to our fallenness, lifestyles, ways of thinking, ways of living, that is defeated. There is ongoing growth in our Christian lives in terms of sanctification. All of that is seen as part of the defeat of sin and evil, and it's a warfare that goes on in our Christian lives. As we then take the gospel to the nations, we not only see people become believers, but we see, then, the effects of the church as we live our lives, pushing back the borders of evil and sin, having an impact as salt and light in the world, that, in some sense — tied to God's common grace as well as saving grace, particularly common grace — sin is restrained, and Satan's work is restrained. All of that comes through the work of the church, the preaching of the gospel, taking the gospel to the nations as we see men and women and boys and girls delivered from sin and death, coming to faith in Christ, lives changed, Satan's power broken. That is part of the ongoing ministry of the church through the preaching and teaching of the gospel.