“The question of 'nationalizing' a people is first and foremost one of establishing healthy social conditions which will furnish the grounds that are necessary for the education of the individual. For only when family upbringing and school education have inculcated in the individual a knowledge of the cultural and economic and, above all, the political greatness of his own country—then, and then only, will it be possible for him to feel proud of being a citizen of such a country.”