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.
“I think people think Jim Carrey's just wild and crazy. He really is very disciplined. It is true of Eddie Murphy and Robin Williams as well.”
“It is very wicked for you not to take care of your masters goods, but how much worse is it to pilfer and steal from them, whenever you think you shall not be found out.”