• By happiness I mean here a deep sense of flourishing that arises from an exceptionally healthy mind. This is not a mere pleasurable feeling, a fleeting emotion, or a mood, but an optimal state of being. Happiness is also a way of interpreting the world, since while it may be difficult to change the world, it is always possible to change the way we look at it.

    Matthieu Ricard (2011). “The Art of Happiness: A Guide to Developing Life's Most Important Skill”, p.23, Atlantic Books Ltd