Robert A. Heinlein was so famous and well-respected in science fiction circles that he became like Albert Einstein or Noam Chomsky and was asked for his opinion on everything. Some of those opinions were about writing, which is why I’ve brought the subject up here. He said, ‘Never revise, except to editorial demand’. Jack Kerouac was also famous for saying, ‘First thought, best thought’, but while he might have famously written everything out on one spool of paper without interruptions, he was a planning maniac. His notebooks are crammed with very detailed information about what he was going to write once he sat down in front of the typewriter and paper roll and began to pound on the keys.