What is your sentence? 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?