In this book John Piper addresses the spiritual dilemma of lacking a genuine desire for God, arguing that true Christianity requires a supernatural delight in Christ rather than mere duty. He contends that this fight for joy is an essential struggle because valuing God above all else is the core of faith and the only way to truly glorify Him. To cultivate this affection, the author suggests disciplined meditation on Scripture, persistent prayer, and the intentional use of physical means like fasting and rest. He also acknowledges the reality of spiritual darkness and depression, encouraging believers to persevere through "gutsy guilt" by preaching the gospel to themselves. Ultimately, the goal is to obtain a satisfaction in Jesus that is powerful enough to fuel sacrificial love and mission even in the face of suffering.