Scott Fitzgerald made me want to be a writer. Of course, that isn't the same thing at all as wanting to write.
When I was sixteen I wanted to write. By the time I was twenty-five I had to write.
Now I'm fifty-seven I don't give a fuck about being a writer. But I still have to write. When I lose that desire - and there are times when I can't write, sometimes for months at a time - then I know it's the end.