Saying

Sayings were pithy statements expressing some truth, passed on orally.

As later quoted to Rassilon, there was, during the Last Great Time War, a saying about the Doctor of War: "The first thing you notice about the Doctor of War is, he's unarmed. For many, it's also the last." (TV: Hell Bent)

Behind the scenes

 * According to The Dalek Dictionary, "The one beside you is yourself" was a Dalek saying, signifying brotherhood among their species.