Institutio Oratoria (1.3.5-1.3.7)

They have no real power and what they have is but of shallow growth: it is as when we cast seed on the surface of the soil: it springs up too rapidly, the blade apes the loaded ear, and yellows ere harvest time, but bears no grain. Such tricks please us when we contrast them with the performer's age, but progress soon stops and our admiration withers away.

Such indications once noted, the teacher must next consider what treatment is to be applied to the mind of his pupil. There are some boys who are slack, unless pressed on; others again are impatient of control: some are amenable to fear, while others are paralysed by it: in some cases the mind requires continued application to form it, in others this result is best obtained by rapid concentration. Give me the boy who is spurred on by praise, delighted by success and ready to weep over failure.

Such an one must be encouraged by appeals to his ambition; rebuke will bite him to the quick; honour will be a spur, and there is no fear of his proving indolent.