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

Education has now become the chief problem of the world, its one holy cause. The nations that see this will survive, and those that fail to do so will slowly perish. . . . There must be re-education of the will and of the heart as well as of the intellect; and the ideals of service must supplant those of selfishness and greed.

Muscles are in a most intimate and peculiar sense the organs of the will.

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

Adolescence as the time when an individual ‘recapitulates’ the savage stage of the race’s past.

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.

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