Your work isn't just to learn and say the lines. Your work is to figure out what the chatter in your brain is, that's going on under the lines. It doesn't matter whether you're speaking or not speaking because your mind is working the way your character's mind would work.
“A man is not rightly conditioned until he is a happy, healthy, and prosperous being; and happiness, health, and prosperity are the result of a harmonious adjustment of the inner with the outer of the man with his surroundings.”