What makes you tick?

What makes you tick? No, I dont mean "what ticks you off?". That is another topic entirely :D. I mean if you were a clock, what is your battery? What makes it possible for you to move from second to second, or in human terms, from day to day, week to week, or month to month and so on.

What makes you get up everyday, and get to the work at hand? What pushes you on to the next thing to do? Is it your family's joy and comfort, or is it your own? Is it something that you look forward to on the weekend? Is earning your superior's admiration/appreciation your motivation? Are you "living" life or are you simply leading, as they call it, a mundane existence?

Till date, I havent found an answer to the question, "What is the purpose of life?". After witnessing and reading about the various incidents occuring everyday all around us, I have begun to accept the answer that there is no particular purpose after all; just live and let live. However, my heart refuses to quiet down so simply, every so often it raises its thinking cap and pops the same question again. Will enlightenment ever strike me?