Oneness with Nature is the glory of childhood; oneness with childhood is the glory of the Teacher.

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

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.

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.

Normal children often pass through stages of passionate cruelty, laziness, lying and thievery.