Let's say John hears from others that he seems perfect for some job/field, or a natural at that job/field. "You really ought to do this or that." Further, John is aware that he is very skilled at that activity, and would be a natural at it (in other words, it's not just mom's wishful thinking that her son should be a doctor). However, John has no interest in pursuing this field, and would rather do something else. Does he owe it to the world at large to follow the unwanted path and do great things for humanity?