A friend of mine once described a former boss with a sentence I have never forgotten. “He was never wrong,” my friend said. “And that was the worst thing about working for him.” The boss was not stupid. He was not cruel. He was simply more interested in being right than in being helpful. Every conversation became a contest. Every disagreement required a winner. Nobody grew under his leadership, because growth requires room to be wrong, and he never gave anyone that room. The distinction...