Continuing on the book Flow by Mihaly Csikszentmihaly, the author provided some interesting aspects of happiness (p.2-3)
“Happiness, in fact, is a condition that must be prepared for, cultivated, and defended privately by each person. People who learn to control inner experience will be able to determine the quality of their lives, which is as close as any of us can come to being happy”
“The best moments usually occur when a person’s body or mind is stretched to its limits in a voluntary effort to accomplish something difficult and worthwhile.”
A bit intellectual, but it is food for thought.