If you believe the world will be a better place because you have both the desire and the means to take charge, that's the time for you to jump in. It doesn't matter if you rise up to take the lead only once or twice in your entire working life or if you do it daily. There are so many moments when you can make a difference--by enriching an outcome, saving a great idea, defending the beleaguered or downtrodden, and not least, expressing your own gifts and wisdom.