In his book, How to grow as a photographer, Tony Luna writes:
It's the mystery that takes hold of you first. You learn a few basic things about focus, composition, lighting, perspective - and then the technical things go from something mechanical to an extension of yourself. That mystery roots itself as passion and, pretty soon, all you can think about is the next shot. You walk down a street and the telephone poles line up for you, or a ray of sunlight bounces off a window and into your imagination, or a shadow belies an illusion and you gasp at the wonder of it all. All at once you are hooked. You dream about your next composition, you sketch out ideas on napkins, you learn a new way of communicating without saying a word. If necessity is the mother of invention, then passion is the lover that invades your most mundane thoughts and elevates everything you once saw as ordinary to a new level of spectacle.
(How to grow as a photographer - Reinventing your career, Tony Luna, Allworth Press, New York, 2006)