In a crisis, the body's burst of adrenaline can boost the average person's physical abilities, so that a man is able to lift a car off a trapped bicyclist and a mother can fight off a polar bear threatening her son. Author Mark Chanski makes the case that encouragement is able to do emotionally and psychologically for the soul what adrenaline does for the body. While Christians are sometimes reluctant to offer encouragement, we must do...