cannot but have theories of the meaning of their associated life and conduct ensuing from those theories. And as the individual man, when he attains a fresh stage of growth, inevitably changes his philosophy of life, and the grown-up man sees a different meaning in it from the child, so too associations of men — nations — are bound to change their philosophy of life and the conduct ensuing from their philosophy, to correspond with their development.

The difference, as regards this, between the individual man and humanity as a whole, lies in the fact that the individual, in forming the view of life proper to the new period of life on which he is entering and the conduct resulting from it, benefits by the experience of men who have lived before him, who have already passed through the stage of growth upon which he is entering.