In a world of manifold and conflicting ideologies it seems safe to say that there are only two forces which are at once sufficiently universalist in their claims and sufficiently extensive in their influence to enlist the allegiance of vast segments of the world's population. Without attending to the manifest differences which divide them internally, we can recognize in each a unity of purpose and viewpoint which permits us to refer to them simply as Christianity and communism. Whatever one's view of the future of these two forces, they are at the present time the most significant forces which can—or will—address themselves to the major ills which plague our world.