With any actor, if you know your character well enough, you'll know pretty much what he would say under any circumstance, or whatever situation might rear its head.
“Any dog, you put him in the corner, no matter if they're vicious or not, they're going to bite back.”
“I went to Sunday School and liked the stories about Christ and the Christmas star. They were beautiful. They made you warm and happy to think about. But I didn't believe them.”