I took the above video when I was in Alaska 2 years ago. A couple things I noticed:
1. These dogs were MADE to pull a sled.
2. These dogs could not WAIT to pull the sled.
3. These dogs LOVED pulling a sled.
What were you MADE to do? What can you not WAIT to do? What do you LOVE doing? That's passion. Its' what drives you. It's a cause, a purpose, a mission that grabs you by the throat and doesn't let you go until you do something about it.