Being an only child is a disease in itself.

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.

Abundance and vigor of automatic movements are desirable, and even a considerable degree of restlessness is a good sign in young children.

Of all work-schools, a good farm is probably the best for motor development.

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.

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

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