Orator Passage 17

ad has tot tantasque res adhibenda sunt ornamenta innumerabilia; quae sola tum quidem tradebantur ab eis qui dicendi numerabantur magistri ; quo fit ut veram illam et absolutam eloquentiam nemo consequatur, quod alia intellegendi alia dicendi disciplina est et ab aliis rerum ab aliis verborum doctrina quaeritur.

To all these numerous and important subjects innumerable ornaments must be added. At that time these alone were taught by those who were counted as masters of speaking. Hence no one attains that true and complete eloquence, because understanding and speaking are taught as separate disciplines, and the knowledge of things is sought from some teachers, that of words from others.

À toutes ces matières si nombreuses et si considérables, il faut ajouter d’innombrables ornements. Or ceux qui passaient alors pour les maîtres de l’art oratoire n’enseignaient que ces ornements. Voilà pourquoi personne n’atteint cette éloquence véritable et accomplie: la discipline de la pensée est distincte de celle du discours, et l’on demande aux uns la science des choses, aux autres celle des mots.