I recently stumbled upon this quote by Carl Gustav Jung, the founder of Analytic Psychology. Though I feel that people can change considerably over the course of a lifetime, Jung reminds us that we may possess an unchangeable core, e.g., a set of “drives” or “needs” that stay the same throughout our lives, to be manifested through different activities and vocations (please see the article on self-determination theory on the link to Positive Psychology).
Mappalicious 
I am reminded by this great Quote that not only your activities, I guess the selfmotivated ones are at core, but also your ability to let time pass without apparent activity of even to just be bored, are important descriptors of sides of your personality. Parents knew that all times.
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