Education has now become the chief problem of the world, its one holy cause. The nations that see this will survive, and those that fail to do so will slowly perish. . . . There must be re-education of the will and of the heart as well as of the intellect; and the ideals of service must supplant those of selfishness and greed.

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

Being an only child is a disease in itself.

Man is largely a creature of habit, and many of his activities are more or less automatic reflexes from the stimuli of his environment.

Precisely what menstruation is, is not yet very well known.

Muscles are in a most intimate and peculiar sense the organs of the will.

Civilization is so hard on the body that some have called it a disease, despite the arts that keep puny bodies alive to a greater average age, and our greater protection from contagious and germ diseases.