I wrote a post on the same title a few weeks back. Flow is a state of mind filled with focus, joy and meaning. It was proposed and researched by Mihaly Csikszentmihalyi, who describes it thus:
… being completely involved in an activity for its own sake. The ego falls away. Time flies. Every action, movement, and thought follows inevitably from the previous one, like playing jazz. Your whole being is involved, and you’re using your skills to the utmost.
I have just begun reading Csikszentmihalyi’s book: Flow: The Psychology of Optimal Experience. Below are a couple of sentences from the second page :
What I “discovered” was that happiness is not something that happens… It does not depend on outside events, but, rather, on how we interpret them. Happiness, in fact, is a condition that must be prepared for, cultivated, and defended privately by each person.