These ten rules from the Immaculate Heart College Art Department are incredibly good advice for just about everything you do in life:
6. Nothing is a mistake. There is no win and no fail. There is only make.
7. The only rule is work. If you work it will lead to something. It's the
people who do all of the work all the time who eventually catch on to things.
8. Don't try to create and analyse at the same time. They're different processes.
9. Be happy whenever you can manage it. Enjoy yourself. It's lighter than you think.
(via Kottke)
Update: Karen sez, "These were compiled by students of Sister Corita Kent."