passion

Some people stick in your brain. (For different reasons).

I met a police officer last week. This guy loves his job. Loves it.
L-o-v-e-s i-t! And (unsurprisingly) he is really good at it too.

His passion has lodged in my head. Inspired me.

Enthusiasm like that is contagious. It encourages you to look at your own level of commitment and interest. It helps you refine your activity to maximise your own experience. It boosts your way of being. I love that.