I reviewed my life when I turned forty. I had the desire to keep going to a higher level and to make a greater impact, but I realized that I had leveraged my time as much as I possibly could, and it would have been impossible to sharpen the focus on my priorities any more than it already was. In other words, I could not work harder or smarter. That left me only one choice: learning to work through others.
John Maxwell, The 21 Irrefutable Laws of Leadership