Constant muscular activity was natural for the child, and, therefore, the immense effort of the drillmaster teachers to make children sit still was harmful and useless.

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

Adolescence is a new birth, for the higher and more completely human traits are now born.

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

All possible truth is practical. To ask whether our conception of chair or table corresponds to the real chair or table apart from the uses to which they may be put, is as utterly meaningless and vain as to inquire whether a musical tone is red or yellow. No other conceivable relation than this between ideas and things can exist. The unknowable is what I cannot react upon. The active part of our nature is not only an essential part of cognition itself, but it always has a voice in determining what shall be believed and what rejected.

Muscles are in a most intimate and peculiar sense the organs of the will. They have built all the roads, cities and machines in the world, written all the books, spoken all the words, and, in fact done everything that man has accomplished with matter. Character might be a sense defined as a plexus of motor habits.

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