To form an opinion of Justin as a Christian and theologian, we must turn to his _Apology_ and to the _Dialogue_ with the Jew Trypho, for the authenticity of all other extant works attributed to him is disputed with good reason. The _Apology_--it is more correct to speak of one _Apology_ than of two, for the second is only a continuation of the first, and dependent upon it--was written in Rome about 150. In the first part Justin defends his fellow-believers against the charge of atheism and hostility to the state. He then draws a positive demonstration of the truth of his religion from the effects of the new faith, and especially from the excellence of its moral teaching, and concludes with a comparison of Christian and Pagan doctrines, in which the latter are set down with naive confidence as the work of demons. As the main support of his proof of the truth of Christianity appears his detailed demonstration that the prophecies of the old dispensation, which are older than the Pagan poets and philosophers, have found their fulfilment in Christianity. A third part shows, from the practices of their religious worship, that the Christians had in truth dedicated themselves to God. The whole closes with an appeal to the princes, with a reference to the edict issued by Hadrian in favour of the Christians. In the so-called _Second Apology_, Justin takes occasion from the trial of a Christian recently held in Rome to argue that the innocence of the Christians was proved by the very persecutions.