Walter Murch: Somebody once asked WH Auden, is it true that you can write only what you know?” And he said, “Yes it is. But you don’t know what you know until you write it.” Writing is a process of discovery of what you really do know. You can’t limit yourself in advance to what you know, because you don’t know everything you know.

The Conversations: Walter Murch and the Art of Editing Film by Michael Ondaatje

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