" People who know how to transform stress into enjoyable challenge spend very little time thinking about themselves. They are not expending all their energy trying to satisfy what they believe to be their needs, or worrying about socially conditioned desires. Instead their attention is alert, constantly processing information from their surroundings. The focus is still set by the person’s goal, but it is open enough to notice and adapt to external events even if they are not directly relevant to what he wants to accomplish. "

― Mihaly Csikszentmihalyi , Flow: The Psychology of Optimal Experience