"[T]he individual in whom the will for the light is strong and clear finds his heart inextricably bound up with the struggle of the forces of light in his native place and time. Much as he may long for the opportunity of fuller self- expression in a happier world, he knows that for him self-expression is impossible save in the world in which his mind is rooted. The individual in whom the will for the light is weak soon persuades himself that his opportunity lies elsewhere."