What is the role of the human will in salvation? How are we to understand predestination? Why does God choose some, but not all? Is he the author of evil? On this special edition of the program, we're airing a conversation between Michael Horton and Roger Olsen recorded live at Biola University concerning their differences over the issue of grace and free will. This event was inspired by two books recently published by Zondervan: For Calvinism, by Michael Horton, and Against Calvinism, by Roger Olsen. White Horse Inn: know what you believe and why you believe it.