The teacher should have some knowledge of the principles of education; should know what subjects are best fitted for the child considering his age, and how to make these subjects attractive; should know, too, how to vary the lessons, so that each power of the child's mind should rest after effort, and some other power be called into play. She should know how to incite the child to effort through his desire of approbation, of excelling, of advancing, his desire of knowledge, his love of his parents, his sense of duty, in such a way that no one set of motives be called unduly into play to the injury of the child's character. But the danger she must be especially alive to, is the substitution of any other natural desire for that of knowledge, which is equally natural, and is adequate for all the purposes of education.
Emulation becomes suicidal when it is used as the incentive to intellectual effort, because the desire for knowledge subsides in proportion as the desire to excel becomes active. As a matter of fact, marks of any sort, even for conduct, distract the attention of children from their proper work, which is in itself interesting enough to secure good behaviour as well as attention.
A few pages on:
[T]he custom of giving home-work, at any rate to children under fourteen, is greatly to be deprecated. The gain of a combination of home and school life is lost to the children; and a very full scheme of school work may be carried through in the morning hours.