The phrase “holy, holy, holy” appears twice in the Bible, once in the Old Testament (Isaiah 6:3) and once in the New (Revelation 4:8). Both times, the phrase is spoken or sung by heavenly creatures, and both times it occurs in the vision of a man who was transported to the throne of God: first by the prophet Isaiah and then by the apostle John. Before addressing the three-fold repetition of God’s holiness, it’s important to understand what exactly is meant by God’s holiness.