Khekheperre-Sonbu, priest of Heliopolis: The Admonitions of Khekheperre-Sonbu.
Would that I had unknown utterances, sayings that are unfamiliar, even new speech that has not occurred (before), free from repetitions, not the utterance of what has [long?] passed, which the ancestors spake.Khekheperre-Sonbu lived during the reign of Pharaoh Sunusret II, the fourth Pharaoh of the Twelfth Dynasty (Middle Kingdom) therefore his dates are unknown. Wikipedia places him in the 19th century B.C. however Will Durant places him in the 22nd century B.C. Thus as Plutarch says, chronology in general is uncertain.