Normally, successful people are highly committed to their work. Here is the problem: the more committed we are to a given path the harder it is for us to admit when it's time to leave. This is why leaders need term limits — it is often just too difficult for them to set these for themselves.

I have had the privilege of working with more than 120 CEOs. I've also had the unfortunate privilege of working with four CEOs for whom it was time to leave. I said to them, "It is time to leave now. Leave with dignity. Don't embarrass yourself." I failed in all four cases. They didn't leave, and a couple of them were on the covers of national magazines — embarrassing themselves and the company.