What are you passionate about?

The other day, someone asked me what I was passionate about. I was caught by surprise. What should I say? Do I really want to share my feelings with these people? Before I could come up with something fitting, another said I was passionate about chemistry. I added math to the list, and the conversation moved on. 

Now, this question haunts me, and I couldn't be more dissatisfied with my answer. I am passionate about knowledge of course, but also God, family, freedom, photography, jewelry, music, literature, and continuously improving myself. 

It was a challenge for me to make this list, but next time someone asks this question, I'll be prepared.