As long as I am given the opportunity to keep performing and keep exploring in whatever medium I'll be happy. As long as I get to spend time with my family I'll be happy. As long as I can write in some form I'll be happy. It is the essential things like that I equate with happiness.
Every man judges his own happiness and satisfaction with life in terms of his possession or lack of possession of those things that he considers worthwhile and valuable.
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What I mean by that is that the point of life as I see it is not to write books or scale mountains or sail oceans but to achieve happiness and preferably an unselfish happiness.