Susan Cain – Flow is an optimal state in which you feel totally engaged Share this quote: Flow is an optimal state in which you feel totally engaged in an activity…In a state of flow, you’re neither bored nor anxious, and you don’t question your own adequacy. Hours pass without your noticing. – Susan Cain Is this quotation insightful, though-provoking, useful? Click on a star to rate it! Submit Rating Average rating 0 / 5. Vote count: 0