Commitment builds passion (not the other way around).

Common advice says "Do something you love. Build something you're passionate about."

But the reality is that success is what actually builds passion over time.

When you take a hobby or an interest and try to make a business out of it, what you often end up doing is killing your passion and interest in the hobby (b/c now it's work, you have to do it, and you don't get to enjoy it in all the ways you once did).

However when you start a business with a true and core customer problem in-mind, start to find success and get adoption, more often than not you'll find that your own interest and passion for the problem, the customer, and business just continues to grow over time.

For the first time founder, it's a bit counter-intuitive...but ask almost any successful/passionate business owner which came first (the passion or the commitment) and I'm pretty confident they'll all say "the commitment".