The success of the education of Cicero probably became a commonplace among Latin school-masters and Latin writers. In the dialogue De Oratoribus, attributed to Tacitus, the story of it is given by Messala when he is praising the orators of the earlier age. "We know well," says Messala, "that book of Cicero which is called Brutus, in the latter part of which he describes to us the beginning and the progress of his own eloquence, and, as it were, the bringing up on which it was founded. He tells us that he had learned civil law under Q. Mutius Scævola; that he had exhausted the realm of philosophy--learning that of the Academy under Philo, and that of the Stoics under Diodatus; that, not content with these treatises, he had travelled through Greece and Asia, so as to embrace the whole world of art. And thus it had come about that in the works of Cicero no knowledge is wanting--neither of music, nor of grammar, nor any other liberal accomplishment. He understood the subtilty of logic, the purpose of ethics, the effects and causes of things." Then the speaker goes on to explain what may be expected from study such as that. "Thus it is, my good friends--thus, that from the acquirement of many arts, and from a general knowledge of all things, eloquence that is truly admirable is created in its full force; for the power and capacity of an orator need not be hemmed in, as are those of other callings, by certain narrow bounds; but that man is the true orator who is able to speak on all subjects with dignity and grace, so as to persuade those who listen, and to delight them, in a manner suited to the nature of the subject in hand and the convenience of the time."[42]