"Goliath Must Fall" is a book by Louie Giglio that explores the concept of overcoming personal giants in life, such as fear, addiction, and insecurity. The title references the biblical story of David and Goliath, where David defeats the giant Goliath, symbolizing the triumph of faith and courage over seemingly insurmountable challenges. In the book, Giglio emphasizes that everyone faces their own Goliaths, but through faith and reliance on God, individuals can find strength to confront and conquer these obstacles. The message encourages readers to recognize their potential and embrace a life of victory and purpose.