Our educational problem is, naturally, different from all others. We are committed to an idea of liberty. We make this principle of freedom the dominant in all our national life. We have not tried, and cannot consistently attempt to centralize our educational institutions very much, or even allow our culture to become crystallized into a definite type, for this would be almost as bad as denying our principle of religious freedom. But we cannot, in the other direction, become too diversified intellectually, and still less in regard to more fundamental aspects of life, for this would break up our unity altogether, or determine it more and more in the direction of political coercion. Thus far, it appears, it has been our great virtue as a people that we have remained united by emotional forces, or by the suggestive power of an idea. Sooner or later we shall need to see whither our present tendencies lead, and education must in all probability be put to work to control and regulate the elements that make for unity and for disruption in our life. _Our work as educators will be to maintain a working harmony in the affective and instinctive life of the people._ We need now, and we shall need more and more, religious, moral and aesthetic unity in our life as a nation--not a forced and superficial agreement, but a deep harmony of ideals and moods. This purpose must never be lost sight of by the educator. It must be made to pervade all our educational philosophy and all our plans for the school. This educational problem exists of course everywhere in some degree, and in regard to all manner of social groups. But American life as a whole is peculiarly a growth in which diverse and even divergent elements must continue to be brought together and held together through the power of ideas which are subject to many influences. Diversity and differentiation are added as fast as the process of assimilation can be carried on. There can be no closing up of differences in a final perfection and security.