All the "great" people I can think of have something in common: they believed in something, acted on it, and happened to become great while doing so. Wanting to

All the "great" people I can think of have something in common: they believed in something, acted on it, and happened to become great while doing so. Wanting to be great and then looking for a field to be great in seems to me to be putting the cart in front of the horse. So, question for you: what do you believe in? What do you care enough about to devote your life to it?