I have to have my personal beliefs aligned with my goals to be motivated. And when they are, there is nothing I can do to stop it. It just comes bubbling up, and frankly, I scare people, sometimes, in the level of my motivation.
I also feel a deep-seated need to get to the center of something and figure out puzzles, once engaged.
It's why I don't always make a good salesman/worker. If I have to "fake it", I usually just quit, or give something nothing but lip-service.
Which probably explains why I've had 40+ jobs in my life.