How do you answer 'Tell about a time when the duties and responsibilities available in a specific position overlapped with duties and responsibilities that brought you personal satisfaction'?

I would answer this question as follows: In my current position, it is often necessary for me to juggle my personal desires with my professional ambitions. I seek to balance these two forces as best I can, always keeping perspective that I work very hard so that I can accomplish my personal goals. It's a symbiotic relationship- one cannot exist in my life without the other.