For many Christians, it goes without saying that God’s ultimate and final revelation is contained in the words of Scripture, the Old and New Testaments. Nothing needs to be added for our awareness of God, doctrine, or spiritual edification. They believe that all further revelation is qualitatively inferior and different in kind from holy scripture- an elaboration on God’s word spoken through the authors of scripture. The holy books of other religions and the insights of Christian and Jewish mystics and social reformers pale by comparison to biblical truth. Any addition to scripture is seen as heretical and worthy of condemnation, after all, as the bumper sticker states, “The Bible...