I recently attended the last day of Professor Clayton Christensen's fall semester class at Harvard Business School. In his final minutes with eighty of the world's best and brightest 25-35 year-olds, there was so much that Professor Christensen could have used his bully pulpit to say. Interestingly he chose to focus not on building and sustaining a successful enterprise, as he had done all semester, but rather on building and sustaining a happy life. Paraphrasing Dr. Christensen's remarks, "In just a few months you will graduate from Harvard Business School, and embark on what to many, including yourselves, will be prestigious, lucrative, high profile careers. But if you want to also have happy lives, you need to know the purpose of your life."