In the culture of mind the most important problem is the thought of "I"; and this thought develops very strongly in a child of thirteen, fourteen, and fifteen. It is very keen about saying I and me. And if this faculty is softened at that particular period in childhood, while the child is growing up, it will be much better. This faculty shows itself especially when the child is cross, when it is in a temper, when it wants to defend itself, and when it wants to express, "This I own, this is mine, and nobody else must touch it, and nobody else must take it." At such times it must be softened. At thirteen, fourteen, and fifteen the child is more thoughtful, and if at times of anger there is an effort made by the guardians to help it to look at things rightly and from their point of view, it is easier at this time than it was in its early childhood.