The Christian life is one of dualities: we are simultaneously sinner and saint, we know believers and non-believers, we interact in the left and right kingdoms, and we hear Law and Gospel. These seemingly competing dualities can frustrate Christians as they try to live out their faith. Many wonder if the Bible presents conflicting ideas - and how, in light of that confusion, can Christians be salt and light in a world that is often opposed to Christianity? But these dualities actually focus the Christian faith. As readers grow in their understanding of this knowledge, they will be encouraged to live out their faith more fruitfully, abundantly, and effectively. They will have the tools to face their struggles and return to their identity in Christ.