Think about meditation. When meditating we are alone with ourselves, our inner child, and our alter ego, our truth. There is a guided meditation and non-guided, which is done in silence and mostly with eyes closed. Most of us start with a guided version and slowly move to the one without words. The one in which we only use our mind and internal monologue. Unless you are a natural, you need a guide to go deep inside yourself and retrain your brain. The same goes for an actor, who needs a director or a coach to guide him, to develop the depth for his character, which is only the tool used to get an actor to act like he would in real life. It is the look, expression, movement, and thoughts that make actor's pause and his character's come alive. Words don't matter when silence speaks.