"I'm not here because I have to work. I'm here because I want to change the world"

I was watching ER last night and this was a quote from one of the new doctors in the ER department. He quickly followed this with "I want to change the way we practice medicine every single day"

It just made me think of Steve Clayton and his mission at Microsoft to change the world or go home. It does make you think...what have I really done today to achieve this???