"Honor set you on the kingsroad... and honor brought you back.""My friends brought me back," Jon said. "Did I say it was your honor?" (71 Jon 9.94-6)
Aw snap. Nice one, Mormont. There's a way in which principles in this book aren't just personal; in Jon's case, the oath was a social bond – and his friends aren't about to let him run out on this society.