Cicero, Brutus 26.7
“Greece is the witness to this because it was set aflame with a desire for eloquence and has surpassed in it and exceeded other places But Greece also has greater antiquity in all arts which it not only discovered but perfected because the power and abundance of speaking was developed by the Greeks. When I consider Greece, Atticus, your Athens occurs to me especially and shines out like a lighthouse. It is here that an orator first showed himself and here that oratory began to be entrusted to monuments and writings.”
vii. Testis est Graecia, quae cum eloquentiae studio sit incensa iamdiuque excellat in ea praestetque ceteris, tamen omnis artis vetustiores habet et multo ante non inventas solum sed etiam perfectas, quam haec est a Graecis elaborata dicendi vis atque copia. In quam cum intueor, maxime mihi occurrunt, Attice, et quasi lucent Athenae tuae, qua in urbe primum se orator extulit primumque etiam monumentis et litteris oratio est coepta mandari.