I think it's imperative to follow your heart and choose a profession you're passionate about, and if you haven't found that 'spark' yet, if you're not sure what you want to do with your lives - be persistent until you do.
“In order to acquire a growing and lasting respect in society, it is a good thing, if you possess great talent, to give, early in your youth, a very hard kick to the right shin of the society that you love. After that, be a snob.”