"What did Spence learn from Collins? “You’re only as young as the new things you do,” he writes, “the number of ‘firsts’ in your days and weeks.” Ask any educator and they’ll agree: We learn the most when we encounter people who are the least like us. Then ask yourself: Don’t you spend most of your time with people who are exactly like you? Colleagues from the same company, peers from the same industry, friends from the same profession and neighborhood?<p>It takes a real sense of personal commitment, especially after you’ve arrived at a position of power and responsibility, to push yourself to grow and challenge conventional wisdom. Which is why two of the most important questions leaders face are as simple as they are profound: Are you learning, as an organization and as an individual, as fast as the world is changing? Are you as determined to stay interested as to be interesting? Remember, it’s what you learn after you know it all that counts."