"Dayodhuam: I have heard the key Turn in the door once and turn once only We think of the key, each in his prison Thinking of the key, each confirms a prison."

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Truth is a pursuit, it's a quest. And proof is certainly in the pudding in this particular instance, because the film, and the evidence accumulated in making the film, led to this man's release from prison. And that's hardly ever happened, if it's happened at all, in any other film that I can think of.

— Errol Morris