Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
Otherwise your delicate, over trained voice will succumb before any unusual exertion, like bodies accustomed to the oil of the training school, which for all the imposing robustness which they display in their own contests, yet, if ordered to make a day's march with the troops, to carry burdens and mount guard at night, would faint beneath the task and long for their trainers to rub them down with oil and for the free perspiration of the naked limbs.
Who would tolerate me if in a work such as this I were to prescribe avoidance of exposure to sun, wind, rain or parching heat? If we are called upon to speak in the sun or on a windy, wet or warm day, is that a reason for deserting the client whom we have undertaken to defend? While as for the warning given by some that the orator should not speak when dyspeptic, replete or drunk, or immediately after vomiting, I think that no sane person would dream of declaiming under such circumstances.
There is, however, good reason for the rule prescribed by all authorities, that the voice should not be overstrained in the years of transition between boyhood and manhood, since at that period it is naturally weak, not, I think, on account of heat, as some allege (for there
For this reason the nostrils and the breast swell at this stage, and all the organs develop new growth, with the result that they are tender and liable to injury. However, to return to the point, the best and most realistic form of exercise for the voice, once it has become firm and set, is, in my opinion, the practice of speaking daily just as we plead in the courts. For thus, not merely do the voice and lungs gain in strength, but we acquire a becoming deportment of the body and develop grace of movement suited to our style of speaking.