Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
and no one would ever convince me that it is not desirable to differentiate courses of study with this in view. One boy will be better adapted for the study of history, another for poetry, another for law, while some perhaps had better be packed off to the country. The teacher of rhetoric will distinguish such special aptitudes, just as our gymnast will turn one pupil into a runner, another into a boxer or wrestler or an expert at some other of the athletic accomplishments for which prizes are awarded at the sacred games.
But on the other hand, he who is destined for the bar must study not one department merely, but must perfect himself in all the accomplishments which his profession demands, even though some of them may seem too hard for him when he approaches them as a learner. For if natural talent alone were sufficient, education might be dispensed with.