Because we were all born with one. Were you born to inspire, teach, lead, write, paint, invent things, research things, discover things?
The only way to find out is through action.
If you fail to yield to the silent whisperings - the subtle hints, promptings, or perceptions, to do a certain thing, to live a certain way, to change direction, to begin a different journey - then you are not only doing yourself a disservice, but also the world.
You don’t know unless you try. Try. Try something. That is all that is asked of you.