But here we will not try to pass judgment on the objective value of actions; we will be concerned instead with the more modest task of describing the subjective order that a unified purpose brings to individual consciousness. In this sense the answer to the old riddle "What is the meaning of life?" turns out to be astonishingly simple. The meaning of life is meaning: whatever it is, wherever it comes from, a unified purpose is what gives meaning to life.
— Flow: The Psychology of Optimal Experience
by Mihaly Csikszentmihalyi