Modern man was not meant to do his best work before forty but is by nature, and is becoming more so, an afternoon and evening worker.

.. every step of the upward way is strewn with wreckage of body, mind, and morals.

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

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

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

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.