When actors are talking, they are servants of the dramatist. It is what they can show the audience when they are not talking that reveals the fine actor.
“I auditioned for the role of an angel in the Nativity play at school. I didn't get it. I auditioned for Mary; didn't get it. So I made up the character of the sheep who sat next to Baby Jesus.”
“Life exists in the universe only because the carbon atom possesses certain exceptional properties.”