I have a theory. It’s not a popular theory. In fact, when I posed it as a question on Facebook there was some disagreement. But I maintain my thesis. Here it is: people who are content will not change. There would be no need. They will stay in their comfort zone with no desire to leave. It takes unhappiness, a burr in the saddle, some kind of discomfort to prompt or prod us to level up, so to speak.