Not to want to say, not to know what you want to say, not to be able to say what you think you want to say, and never to stop saying, or hardly ever, that is the thing to keep in mind, even in the heat of composition.
What has influenced my life more than any other single thing has been my stammer. Had I not stammered I would probably... have gone to Cambridge as my brothers did, perhaps have become a don and every now and then published a dreary book about French literature.