“The most experienced psychologist or observer of human nature knows infinitely less of the human heart than the simplest Christian who lives beneath the Cross of Jesus. The greatest psychological insight, ability and experience cannot grasp this one thing: what sin is….And so it does not know that man is destroyed only by his sin and can be healed only by forgiveness. Only the Christian knows this.”
-Dietrich Bonhoeffer, Life Together and Prayerbook of the Bible, vol. 5 (Minneapolis: Fortress Press, 1996), 115.