Every theory of love, from Plato down teaches that each individual loves in the other sex what he lacks in himself.

This splendid subject [mathematics], queen of all exact sciences, and the ideal and norm of all careful thinking.

The teens are emotionally unstable and pathic. It is a natural impulse to experience hot and perfervid psychic states, and it is characterized by emotionalism. We see here the instability and fluctuations now so characteristic. The emotions develop by contrast and reaction into the opposite.

Puberty for a girl is like floating down a broadening river into an open sea.

Adolescence is when the very worst and best impulses in the human soul struggle against each other for possession.

Daily contact with some teachers is itself all-sided ethical education for the child without a spoken precept. Here, too, the real advantage of male over female teachers,especially for boys, is seen in their superior physical strength,which often, if highly estimated, gives real dignity and commands real respect, and especially in the unquestionably greater uniformity of their moods and their discipline.

The years from about eight to twelve constitute a unique period of human life.