It would be easy to show how much there enters of the conjectural, of superficial resemblances, of debatable interpretation into the systems of the Drews, the Robertsons, the W. B. Smiths, the Couchouds, or the Stahls The historical reality of the personality of Jesus alone enables us to understand the birth and development of Christianity, which otherwise would remain an enigma, and in the proper sense of the word, a miracle.