The old Christian philosophers, the old church fathers, saints, and martyrs, alone give us light and leading. As long as we conceive the divine sonship of Christ from the Jewish or Greek mythological standpoint, the true divine nature of Christ remains a mere phrase. When, however, we call to our aid the most orthodox and enlightened men of the second century, we find that such men as Justin, Tatian, Theophilus, Athenagoras, Apollonius(30) and Clement, to say nothing of Origen, believed in Jesus as the only begotten son of God(31) in the sense which these words had at that time for every one who spoke and thought in Greek. This Son is often represented as distinguishable from the Father, but not as separable. Of a Son of God in the Jewish sense of the word, of a descendant of David, the evangelist would never have said that all things were made by him. That could be affirmed only of the true Son of God, of the Logos, as the thought of God, which is uttered in the visible world. In what sense this Logos was recognised in Jesus, is certainly a difficult question, and here the work of Celsus would have been of great use to us, for he expressly states that he has no objection to the Logos idea; but how philosophers could accept an incarnation(32) of this Logos in Jesus, was beyond his understanding. It must be borne in mind that matter and flesh were held by Celsus to be something so unclean, that according to him the Deity could only operate on matter by means of an endless number of intermediaries (a true _fœtus œonum_). This obscurity in the conception of Jesus as Logos by the Christian church is the reason why Celsus does not regard Joseph as the natural father of Jesus, but Panthera. Origen, of course, denounces this very indignantly; and the legend is nothing more than one of the many calumnies, which are nearly always to be traced among the opponents of a new religion and its founders. For the true nature and the divine birth of Christ, as Origen himself seems to feel, such a story would naturally have no significance whatever. It remains true, however, that no writer of authority of the second and third centuries has clearly explained in what sense the Christian church conceived Jesus as the Logos.