These are nine important principles for the practice of craft:
•Act from principle.
•Begin where you are.
•Define your aim simply, clearly, briefly.
•Establish the possible and move gradually towards the impossible.
•Exercise commitment, and all the rules change.
•Honor necessity. Honor sufficiency.
•Offer no violence.
•Take our work seriously, but not solemnly.
(Originally, there were ten; I removed the one that mentioned music specifically, partly because these aren't music-specific principles, and partly because I didn't like it nearly as much as the other nine.)
(Similar crafty nuggets of thought can be found here. Yeah, only one appears at a time, but keep clicking on "Aphorisms"and you'll get fresh ones.)