Interesting article with a provocative title: "The Designer's Notebook: Passion Versus Professionalism". This is a topic that interests me. He says:
"Passion" is an excuse used by employers to mistreat their employees. Your passion is supposed to make up for the insane hours and low pay for which the industry is notorious. Many job ads emphasize the importance of passion in applicants; few emphasize the quality of life that the employer offers. (from Passion vs. Professionalism")
Reading the whole article, in the end I don't agree with his argument. I think in general passion is a very important thing, and one should strive for it in your chosen profession. Without it, with just professionalism, I think no matter what your work is, it will become drudgery. I say "strive for it" because it's true that no matter how much you love your job, some days you will really despise it. And as my friend Pat used to say about an unpleasant work assignment: "Everyone has to take out the garbage some times"