Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
The latter will still have certain hours allotted him, and there is no reason to fear that a boy will be overloaded by receiving instruction from two different masters. It will not mean any increase of work, but merely the division among two masters of the studies which were previously indiscriminately combined under one: and the efficiency of either teacher will be increased. This method is still in vogue among the Greeks, but has been abandoned by us, not perhaps without some excuse, as there were others ready to step into the rhetorician's shoes.
II. As soon therefore as a boy has made sufficient progress in his studies to be able to follow what I have styled the first stage of instruction in rhetoric, he should be placed under a rhetorician. Our first task must be to enquire whether the teacher is of good character.