You’ll always put a lot more effort into tasks you love doing.
“Find a job you enjoy doing, and you will never have to work a day in your life.” — Mark Twain
When you deeply care about your work, you will enjoy your work more. The whole situation switches from toil to a profession. It’s not your “day job”. It’s what you do. It’s what you are all about. Some people punch a clock; better people are committed to becoming even better because they want to be the best.
Following your passions will also help you overcome any fears. Your focus moves from trying to please others to learning more and gaining mastery in your craft.
You will also be more motivated to succeed. People who don’t love what they do just aim for satisfactory results. People who really care about their craft want to maximize the experience.