" The optimal mental state for training in is called “the flow state”, most famously defined by Mihaly Csikszentmihalyi in his 1988 book Flow. Buy it, read it, you won’t regret it. This book made me realise that the thing I was really trying to teach most of my students was how to develop an autotelic personality, which means a person who is able to set their own goals. "

― Guy Windsor , The Seven Principles of Mastery (The Swordsman's Quick Guide Book 1)