Diz David Mamet da interpretação no teatro:

It's not the actor's job to embellish the play, but to do something more worthwhile and difficult: to resist embellishing it. It's when one resists the impulse to help that the truth emerges. The great actors I've seen in movies or on stage are capable of being quite still, and letting their uncertainty, fear and conficting desires emerge rather than trying to cover them up with their ideas.