It's strange how that works, huh? But having taken philosophy, I do believe that some things are preordained... that we all have destinies to fulfill, and it's finding it and fulfilling it that is the true task on Earth. If you don't find it or you stray from what you were meant to do, then that's when society goes belly-up (as it has been...)
Some people were meant to be doctors, and they feel it.
Some are meant to be police officers, and they feel it, too.
We are meant to teach!