Institutio Oratoria

To the first class belong decisions of previous courts, rumours, evidence extracted by torture, documents, oaths, and witnesses, for it is with these that the majority of forensic arguments are concerned. But though in themselves they involve no art, all the powers of eloquence are as a rule required to disparage or refute them. Consequently in my opinion those who would eliminate the whole of this class of proof from their rules of oratory, deserve the strongest condemnation.