It is a very delicate work to train the child without its realizing that it is being taught. Everything one teaches it must be in such a way that the child does not know that a certain rule or principle is imposed upon it; that is the way to work with it. In laughter, in smiles, in stories, in friendly conversation, things can be told to children that they will always remember; but as soon as they are corrected and one imposes a certain principle upon them they begin to feel the burden of it.