The title of this article suggests the difference between our oldest gospel and our latest. The importance of the theme lies in the fact that this difference is not one of development, such, for instance, as the difference between the laws of Elizabeth's England and the common law of the United States, but is rather the difference of deep and pervasive contrariety and even of sharp and sweeping antagonisms. To the task of setting forth this fateful difference, which affects our common loyalty to the Master, and on the full recognition of which by the church depends in no small measure the future of our Christian faith, the following study is devoted.