Level 5 leaders channel their ego needs away from themselves and into the larger goal of building a great company. It's not that Level 5 leaders have no ego or self-interest. Indeed, they are incredibly ambitious-but their ambition is first and foremost for the institution, not themselves.

For no matter what we achieve, if we don't spend the vast majority of our time with people we love and respect, we cannot possibly have a great life. But if we spend the vast majority of our time with people we love and respect - people we really enjoy being on the bus with and who will never disappoint us - then we will almost certainly have a great life, no matter where the bus goes. The people we interviewed from the good-to-great companies clearly loved what they did, largely because they loved who they did it with.

In the end, it is impossible to have a great life unless it is a meaningful life. And it is very difficult to have a meaningful life without meaningful work. Perhaps, then you might gain that great tranquility that comes from knowing that you've had a hand in creating something of intrinsic excellence that makes a contribution. Indeed, you might even gain that deepest of all satisfactions: knowing that your short time on this earth has been well spent, and that it mattered.

In an ironic twist, I now see Good to Great not as a sequel to Built to Last, but more of a prequel. Good to Great is about how to turn a good organization into one that produces sustained great results. Built to Last is about how you take a company with great results and turn it into an enduring great company of iconic stature.

Genius of AND. Embrace both extremes on a number of dimensions at the same time. Instead of choosing a OR B, figure out how to have A AND B-purpose AND profit, continuity AND change, freedom AND responsibility, etc.

The inner experience of fallure is totally different than failure. Going to fallure means 100% commitment - you leave nothing in reserve, no mental or physical resource untapped, you never give yourself a psychological out. Failure means making a decision to let go, to be less than 100% committed, when confronted by fear, pain and uncertainty.

How can you succeed by helping others succeed? We succeed at our very best only when we help others succeed.