You searched for: “nullumst iam dictum quod non sit dictum prius
Nullumst iam dictum quod non sit dictum prius. (Latin proverb)
Translation: "Nothing is ever said that has not been said before."

From Publius Terentius Afer (c. 185 - 159 B.C.). Terence was the son of a Libyan slave and was born at Carthage. Cicero and Horace admired him for the urbanity and polish of his plays; Caesar praised his love of "pure speech".