The following excerpt is from Lessons In Leadership by Rabbi Jonathan Sacks:
Imagine you have total power. Whatever you say goes. Then one day you decide to share your power with nine others. You now have at best one-tenth of the power you had before. Now imagine that you have a certain measure of influence. Then you decide to share that influence with with nine others whom you make your partners. You now have ten times the influence you had before, because instead of just you there are now ten people delivering the same message.
Power works by division, influence by multiplication. Power, in other words, is a zero-sum-game: the more you share, the less you have. Influence is a non-zero-sum-game: the more you share, the more you have.