The audience should go out front and you should go onstage as if to a hot date, not as if to give blood. No one wants to pay good money and irreplaceable time to watch you be responsible. They want to watch you be exciting. And you can’t be exciting if you’re not excited; and you can’t be excited if you’re thinking about nothing more compelling than your boring old concentration, self-performance, and good ideas.
David Mamet, True and False
Source: improviser.fr David Mamet, l’éthique de l’acteur