Never learn that you can fail.
Catherynne Valente sums up the questions I get regularly on "OMG how can you do all that stuff" in an excelent post called "How to Write a Novel in 30 Days":http://yuki-onna.livejournal.com/553802.htmlMy twist is on the health thing/sacrificing your body. I don't do this as much any more. Not not at all, but sometimes. But yes, never learn that you can fail.