Joy rather than happiness is the goal of life for joy is the emotion which accompanies our fulfilling our natures as human beings. It is based on the experience of one's identity as a being of worth and dignity.
I always thought that one of the reasons why a painter likes especially to have other painters look at his or her work is the shared experience of having pushed paint around.
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I remember when I was 33 or 34 it was devastating because I realized I wasn't a kid anymore. The great thing about 40 was that I really felt like I had life experience and knew what I was doing now.