"We need to practice acting in spite of fear, in spite of doubt, in spite of worry, in spite of uncertainty, in spite of inconvenience, in spite of discomfort, and even to practice acting when we're not in the mood to act."

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An actor must make his needs (goals, wants, objectives) so strong that he is willing to interfere with the other actor in order to get what he needs. Interfering means getting in their way so that what you want is stronger than what they want.

— Michael Shurtleff