Jon Walker. Abilene, Texas: Leafwood Publishers, 2012. 202 pp. (Paperback). My pastor is a big fan of Dietrich Bonhoeffer, and I am slowly becoming one, too, although I find Bonhoeffer’s writing difficult. For one thing, his writing tends to be ponderous, dated and hard to read. More importantly, Bonhoeffer is difficult because he is hard on himself and therefore hard…