Arthur saying 'thank you' to Merlin.<<< but he never said it for all that Merlin truly did for him. He never knew that he saved his life hundreds of times. He is saying thank you for all of the times he didn't give him credit for the things he did.
My favorite story was about a boy who'd live forever but his eyes were heavy with the weight of all he'd seen. / The opening lines from the Doctor Who episode "A Town Called Mercy" for Merlin. This fits a little too well.