This Sunday is Halloween. But more importantly, it’s Reformation Day—when the church celebrates and commemorates October 31, 1517. It was on this day (a Saturday) that a 33-year-old theology professor at Wittenberg University walked over to the Castle Church in Wittenberg and nailed a paper of 95 theses to the door, hoping to spark an academic discussion about their contents. In God’s providence and unbeknownst to anyone else that day, it would become a key event in igniting the Reformation. I thought it might be helpful to ask a few questions of Carl Trueman, Professor of Historical Theology and Church...