Why is it important to be passionate about one's choice of career?

Passion is infectious. When you show passion in what you do, it rubs off on others around you, and brings out their best. If you like what you do, it is easy to get up every morning and go to work. Conversely, if you intentionally pick your career mostly for the money, it gets old pretty soon. Finally, if you do not love what you do, it is unlikely that you will stick to it for long. Burn out rates are high in high stress careers.