Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
We need have no fear at any rate that boys will find their work too exhausting: there is no age more capable of enduring fatigue. The fact may be surprising, but it can be proved by experiment. For the mind is all the easier to teach before it is set.
This may be clearly proved by the fact that within two years after a child has begun to form words correctly, he can speak practically all without any pressure from outside. On the other hand how many years
he started young!Moreover boys stand the strain of work better than young men.
Just as small children suffer less damage from their frequent falls, from their crawling on hands and knees and, a little later, from their incessant play and their running about from morn till eve, because they are so light in weight and have so little to carry, even so their minds are less susceptible of fatigue, because their activity calls for less effort and application to study demands no exertion of their own, since they are merely so much plastic material to be moulded by the teacher.