Douglas Adams said this quote

Adams has done a bit of everything, from radio to television to designing computer games. Not all of them worked out. “These are life’s little learning experiences,” he said. “You know what a learning experience is? A learning experience is one of those things that says, ‘You know that thing you just did? Don’t do that.’ “At the end of all this being-determined-to-be-a-jack-of-all-trades, I think I’m better off just sitting down and putting a hundred thousand words in a cunning order.” Adams writes “slowly and painfully.” “People assume you sit in a room, looking pensive and writing great thoughts,” he said. “But you mostly sit in a room looking panic-stricken and hoping they haven’t put a guard on the door yet.