Castiel: Jack, I’ve killed people who didn’t deserve it… my friends… I’ve killed people I loved. I wish I could tell you that it… that it gets easier, that with time, it hurts less, but that would be a lie because it… it never gets easier. And those moments, they never stop hurting. But that doesn’t mean that you should stop fighting. Doesn’t mean that just because you made a mistake… and that’s what this is, Jack. It’s a mistake. That doesn’t mean that you can’t… can’t be better, do better. I believe that. I have to believe that.
From Supernatural – Season 13 Episode 6: ‘Tombstone’ (13×06)
