New God, New Gospel, New Gladness: How is Christian Joy Distinct

What is the fundamental quality that sets Christians apart from the world? John Piper looks to the affections, arguing that through the gospel, we are given a new gladness in a new God. Thus, “the most basic distinction and essential distinction between the church and the world is not new decisions of the will, new deeds of the hands, or new doctrines in the mind, but a new delight in the heart in the glory of God.”