From the external we turn to the internal evidence. We are asked to believe that this letter was forged on the confines of the age of Irenæus and Clement of Alexandria. But can anything be more unlike the ecclesiastical literature of this later generation, whether we regard the use of the New Testament, or the notices of ecclesiastical order, or the statements of theological doctrine? The Evangelical quotations are still given (as in Clement of Rome) with the formula, 'The Lord said;' the passages from the Apostolic Epistles are still, for the most part, indirect and anonymous. Though two or three chapters are devoted to injunctions respecting the ministry of the Church, there is not an allusion to episcopacy from beginning to end. Though the writer's ideas of the Person of Christ practically leave nothing to be desired, yet these ideas are still held in solution, and have not yet crystallized into the dogmatic forms which characterize the later generation. And from first to last this Epistle is silent upon those questions which interested the Church in the second half of the second century. Of Montanism, of the Paschal controversy, of the developed Gnostic heresies of this period, it says nothing. A supposed reference to Marcion I shall have to discuss presently. For the moment it is sufficient to say that an allusion so vague and pointless as this would be must certainly have missed its aim.
But this argument from internal evidence gains strength when considered from another point of view. The only intelligible theory--indeed, so far as I remember, the only attempt at a theory--offered to account for this Epistle by those who deny its genuineness or its integrity, connects it closely with the Ignatian letters. If forged, it was forged by the same hand which wrote the seven Vossian Epistles; if interpolated, it was interpolated by the person who expanded the three genuine Epistles into the seven. According to either hypothesis, the object was to recommend the Ignatian forgery on the authority of a great Dame; the motive betrays itself in the thirteenth chapter, where Polycarp is represented as sending several of the Ignatian Epistles to the Philippians along with his own letter. This theory is at all events intelligible; and, so far as I can see, it is the only rational theory of which the case admits.