That's fine if you're starting a project or a business from scratch. Choose whatever tools make you happy. But if you work for someone else, chances are you will be stuck using the language they use. And if you are professional, you do it. And you still try to do a good job. Like Tiger Woods switching to Nike clubs.
professional and passionate are not necessarily (and, for most people, not usually) the same things. you can use a php framework professionally and be passionate about rails.
