You must never aspire to 'finish' a house, you can merely hope to start it, and from then on it's an evolutionary process.
I've always tried to be an actor who... I just plod on and try to keep my mouth shut, mind my own business. I find the whole thing about people's lives... I can't understand it. I'm always astonished that people want to know anything about me.
The desire definitely comes from within. There are only a few people who make it to this level and those are the ones who have that innate desire.