It definitely isn't. Passion is just a part of it. I almost did believe that passion is everything, and in the process I almost let my passion handicap me.
It is about passion, yes. But it is more about consistency.
You may have that one thing you are passionate about. Music, books, movies, art, writing, painting, photography, dance, programming, creating websites, training animals - I don't know what you like most. But whatever the case may be, just passion doesn't cut it.