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.

The man of the future may, and even must, do things impossible in the past and acquire new motor variations not given by heredity.

Every theory of love, from Plato down, teaches that each individual loves in the other sex what he lacks in himself.

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

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