"There is one plain rule of life. Try thyself unweariedly till thou findest the highest thing thou art capable of doing, faculties and outward circumstances being both duly considered, and then do it."

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All the theories that acting is reacting to imaginary circumstances as though they are real, and directing is turning psychology into behavior, those are all stabs at something that can't be taught. All the great actors can't talk about what they do, and they don't want to begin to talk about it. They just do it.

— Mike Nichols