Book excerpt: What difference should doctrine make on our day-to-day Christian life? This book summarizes Christianity in 5 core truths—the Trinity, the Son of God, the Spirit, the church, and heaven and hell—to show how theology is intended to bring people closer to God. Drawing from writers throughout church history—particularly St. Augustine, Richard Baxter, and C. S. Lewis—this book summarizes the building blocks of “pure Christianity” and how they shape minds, hearts, and actions, so readers can know simply and concisely what it means to live for God.