21 Laws of Leadership in the Bible: Principles of Leadership as Modeled by the Men and Women in ScriptureBestselling author John Maxwell draws on the stories of men and women in the Bible to show how they modeled what he calls "the 21 irrefutable laws of leadership." Everything I Know About Leadership I Learned From the Bible. When bestselling author John C. Maxwell first began teaching leadership to people in the church, they were often surprised. He was clearly young and inexperienced, yet the ideas he conveyed seemed to go beyond what he should know.