Here's the problem I see: we can't rely upon raw passion by itself to sustain our efforts over time, because like all emotions, it will come and go. Can passion effectively fuel our desire? Absolutely. Is it sustainable? I don't think so.
Have you ever noticed yourself saying the words, "What should I do to get what I want? I've tried everything and nothing seems to work." It seems to be an unanswerable question, but really, there is an answer to this question.