Which detail from the biography of Aesop supports the idea that Aesop was wise?

Aesop was a writer who lived around 600 BC. There are theories who state that he was just a myth, that he did not exist, that he was a name other writers invented for unknown reasons. But leaving the enigmatic side of his life aside, we can agree on something whether he was real or not, the character was a genius for he always wrote stories where moral values and lessons were taught in a very simple way even kids would understand them. And the lessons he taught were of high relevance for his time as well as for the present. To sum up, Aesop was wiser than my other philosophers, writers and thinkers of all history for one reason, his lessons were moral teachings of extreme value and easily presented and learnt.