Heinlein's rules of writing

Five Rules of Success in Writing:

1. You must write.
2. You must finish what you write
3. You must refrain from re-writing except to editorial order
4. You must place it on the market.
5. You must keep it on the market until sold.

From a lecture delivered by Robert A Heinlein in 1973 at Annapolis. Hat tip: Jerry Pournelle