The appropriate direction must be given to the girls and to the boys. One cannot drive both with the same whip. For instance, a word of displeasure will touch the boy on the surface and the girl to the depth; and it is the same with a word of appreciation. Often with the boy it will go in at one ear and out at the other, whereas the girl will keep it with her perhaps for her whole life. Those who think that boys and girls can both be directed in the same way will find in the end that they made a great mistake. The psychology of the boy is quite different from the girl's, and for each a special method must be used in order to bring them up.