Locke’s advice on teaching

The great skill of a teacher is to get and keep the attention of his scholar: whilst he has that, he is sure to advance as fast the learner’s abilities will carry him; and without that, all his bustle and pother will be to little or no purpose. To attain this, he should make the children comprehend, (as much as may be,) the usefulness of what he teaches him; and let him see, by what he has learned, that he can do something which he could not do before; something which gives him some power and real advantage above others, who are ignorant of it. To this he should add sweetness in all his instructions; and by a certain tenderness in his whole carriage, make the child sensible that he loves him, and designs nothing but his good; the only way to beget love in the child, which will make him hearken to his lessons, and relish what he teaches him.

John Locke, Some Thoughts Concerning Education, 161