Change what you're passionate about

I came across an interesting idea in Seth Godin's Linchpin

Transferring your passion to your job is far easier than finding a job that happens to match your passion.

I've read a lot lately about how you should figure out what you're passionate about and then find a way to make money at it. I think about photography, which is something I am passionate about. Would I feel the same way if I had to do it to make money?

The alternative that Godin is proposing is to become passionate about what you're doing now and that will in turn make you more successful because you bring your full self to work.