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" Flow: The Psychology of Optimal Experience. He defines flow as a Zen-like state of total oneness with the activity at hand in which you feel fully immersed in what you’re doing. It’s characterized by a sense of freedom, enjoyment, fulfillment, and skill, and while you’re in it, temporal concerns (time, food, ego/self, etc.) are typically ignored. If you can identify the activity that gives you this sense of flow and make it the focus of your job or hobby, it can also become your sense of purpose. "
― Dan Buettner , The Blue Zones: Lessons for Living Longer From the People Who've Lived the Longest