In the preface to The Roots of Endurance, a collection of biographical sketches on the invincible perseverance in the lives John Newton, Charles Simeon, and William Wilberforce, John Piper, Pastor of Bethlehem Baptist Church in Minneapolis and featured teacher of Desiring God Ministries, writes: As I write this Preface I have just preached to my people several messages in which I pleaded with them to be "coronary Christians," not "adrenal Christians." Not that adrenaline is bad, I said; it gets me through lots of Sundays. But it lets you down on Mondays. The heart is another kind of friend. It...