What is your sentence?
This is a favorite question of the author Daniel Pink, though he acknowledges in his book Drive that it can be traced back to the journalist and pioneering Congresswoman Clare Booth Luce. While visiting John F. Kennedy early in his presidency, Luce expressed concern that Kennedy might be in danger of trying to do too much, thereby losing focus. She told him “a great man is a sentence”—meaning that a leader with a clear and strong purpose could be summed up in a single line (e.g., “Abraham Lincoln preserved the union and freed the slaves.”). Pink believes this concept can be useful to anyone, not just presidents; your sentence might be, “He raised four kids who became happy, healthy adults,” or “She invented a device that made people’s lives easier.” If your sentence is a goal not yet achieved, then you also must ask: How might I live up to my own sentence?
“Why has a book like this never been written before? Here is a persuasive case for the simple and yet extraordinary power of a question. Fascinating, engaging stories give life to a strong argument about how much can be accomplished, in every domain of our lives, ‘just’ by asking questions. Innovators, entrepreneurs, citizens, parents, teachers, idealists and realists—all of us have much to gain by reading 
“Questions have literally moved mountains, powered rockets, and instantly developed images. Berger focuses on what he calls ‘Beautiful Questions’… that can lead to game-changing answers and results. These are questions that, once raised, tend to get people thinking in a different way.”
“The desire to ask bigger and better questions is on the rise… Warren Berger has been tracking a movement toward questioning that is running very strong in Silicon Valley, but also seems to be spreading throughout the business, nonprofit and education sectors.”
Warren on the web