You have to remember that you are part of a craft, and you are constantly building your craft. Ultimately, we are artists, so it comes from us. And I think the tricky thing about being an actor is that we're looking for someone else to give us something... Thinking like an artist and thinking like an out-of-work actor are two different things.
I like to focus on stories that need to be told and are not told enough. When I get bit by that bug, and the story is saying, 'You must tell me,' I then go through a process which is often painful and arduous, and long - and joyful! - of submitting to the story until I prove a worthy enough vessel to get it out.