Philip Yancey provides a thoughtful and passionate explanation of the intertwined roles of suffering and grace in a Christian's life.
He also takes exception, politely, to Dietrich Bonhoeffer's stance of the cost of grace; Yancey posits that grace is neither expensive nor cheap--it is free for us thanks to the cross and resurrection of Jesus.
Talk at University of Virginia 2015 Capps Lecture on Christian Theology