"The Joyful Christian," a book by C.S. Lewis, explores the essence of joy in the Christian faith. Lewis presents a compelling argument that joy is more than just happiness; it is a deep sense of fulfillment that comes from a relationship with God. He contends that true joy can be found in surrendering to God's will and embracing the life He offers. This perspective encourages readers to view joy as an integral part of their spiritual journey, rather than a fleeting emotion.