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.
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 as the time when an individual 'recapitulates' the savage stage of the race's past.
Adolescence is a new birth, for the higher and more completely human traits are now born.