In the early 1930s Henry Miller wrote for himself (while working on Tropic of Cancer) a list of 11 commandments. Five of those fit me well:
1. Work on one thing at a time until finished.
2. Start no more new books.
3. Don’t be nervous. Work calmly, joyously, recklessly on whatever is in hand.
4. Work according to Program and not according to mood. Stop at the appointed time!
5. When you can’t create you can work.
The rest: 6. Cement a little every day, rather than add new fertilizers. 7. Keep human! See people, go places, drink if you feel like it. 8. Don’t be a drought-horse! Work with pleasure only. 9. Discard the Program when you feel like it-but go back to it next day. Concentrate. Narrow Down. Exclude. 10. Forget the books you want to write. Think only of the book you are writing. 11. Write first and always. Painting, music, friends, cinema, all these come afterwards