Free writing

Use the free writing technique. Beginning with the words "In the beginning...", write down your stream of consciousness without stopping to think about it. When your left-brain editor kicks in and tells you to stop and re-read before your 10 minutes are up, ignore her. Remember, you're not writing a ready-to-publish Pullitzer Prize winner, just some interesting thoughts no-one else need ever read. You may be surprised where this challenge takes you.