Sam Winchester: When we finally do find dad, I don't know if he's even gonna want to see me.

Dean Winchester: Sam, dad was never disappointed in you. Never. He was scared.

Sam Winchester: What are you talking about?

Dean Winchester: He was afraid of what could have happened to you if he wasn't around. But even when you two weren't talking, he used to swing by Stanford whenever he could, keep an eye on you, make sure you were safe.