In every age there has been a dominant worldview that people tried to conform to. In an age of faith, everyone asked how they could better serve God. This was their daily concern. In the Industrial Age the question shifted to economics and improving one's lot in life. In an age dominated by science the question shifted again--people asked every day how they could keep up with progress and add to it. As times change, so do people's vision of what is important, and usually they thought they had a better vision than the one which preceded them.
Yet if you back away to see the bigger picture, each age had one thing in common, and it wasn't God, economics, or progress. It was the fundamental idea that life is well lived only if you have a vision. Without one, purpose and meaning are limited.
It turns out that the one question you should ask every day is this: How can I fulfill my vision today? Whether they put it exactly in these words, this is the secret behind the greatest success stories. Someone dedicated his or her life to a plan, project, or set of values larger than any individual. A worthy vision, I think, needs to fulfill certain criteria.