Walter: He's hurting inside, and I think I can help.
Toby: That was empathy. Walter identified emotional pain in someone else and demonstrated empathy.
Paige: You can't empathize if you haven't been through a similar situation yourself. Walter wasn't just being jealous or petty about Tim, was he?
Toby: He wasn't. I know you didn't mean to, but you must have really broken his heart. Now he knows what that feels like, and he is applying that data to someone else. Ralph may not be changing, but Walter certainly is.