"Desiring God: Meditations of a Christian Hedonist" is a book by John Piper that explores the concept of finding joy in God. Piper argues that true happiness comes from seeking pleasure in a relationship with God, emphasizing that God is most glorified when we are most satisfied in Him. The book introduces the idea of "Christian Hedonism," which suggests that pursuing joy in God is not only acceptable but essential for a fulfilling Christian life. Piper uses scripture to support his claims, encouraging readers to delight in God's presence and goodness as the ultimate source of joy.