"Subjective experience is not just one of the dimensions of life, it is life itself. Material conditions are secondary: they only affect us indirectly, by way of experience. Flow, and even pleasure, on the other hand, benefit the quality of life directly. Health, money, and other material advantages may or may not improve life. Unless a person has learned to control psychic energy, chances are such advantages will be useless."
-Mihaly Csikszentmihalyi, Flow: The Psychology of Optimal Experience