Now listen to me. The old man is the Lord Commander of the Night...
Samwell: Now listen to me. The old man is the Lord Commander of the Night's Watch. You'll be with him day and night. Yes you'll clean his clothes, but you'll also take his letters, attend him at meetings, squire for him in battle, you'll know everything, be part of everything. And he asked for you himself. He wants to groom you for command.
Jon: I just, I always wanted to be a ranger.
Samwell: I always wanted to be a wizard.