There it is. [The Doctor nods, agreeing with herself -- which is not at all lost on her.] You're right though. Joy and sorrow are two sides of the same concept, neither one possible without the existence of the other.

[Another sip of her milkshake before she adds quietly.] At least we still have our memories.

[And she does have hers now, remembers every moment.]

Maybe not everyone. But the right people do. That's just it though. I'm looking for someone in particular. I lost her a long time ago, and I think it's the biggest mistake I've ever made.