Eichhorn’s theory of the growth of the Gospels is one very generally accepted; he considers that the present Gospels were not in common circulation before the end of the second century, and that before that time other Gospels were in common use, differing considerably from each other, but resting on a common foundation of historical fact; all these, he thinks, were versions of an “original Gospel,” a kind of rough outline of Christ’s life and discourses, put together without method or plan, and one of these would be the “Memoirs of the Apostles,” of which Justin Martyr speaks.  The Gospels, as we have them, are careful compilations made from these earlier histories, and we notice that, at the end of the second, and the beginning of the third, centuries, the leaders of the Church endeavour to establish the authority of the four more methodically arranged Gospels, so as to check the reception of other Gospels, which were relied upon by heretics in their controversies.

Strauss gives a careful resume of the various theories of the formation of the Gospels held by learned men, and shows how the mythic theory was gradually developed and strengthened; “according to George, mythus is the creation of a fact out of an idea” ("Life of Jesus,” Strauss, vol. i., p. 42; ed. 1846), and the mythic theory supposes that the ideas of the Messiah were already in existence, and that the story of the Gospels grew up by the translation of these ideas into facts:  “Many of the legends respecting him [Jesus] had not to be newly invented; they already existed in the popular hope of the Messiah, having been mostly derived, with various modifications, from the Old Testament, and had merely to be transferred to Jesus, and accommodated to his character and doctrines.  In no case could it be easier for the person who first added any new feature to the description of Jesus, to believe himself its genuineness, since his argument would be:  Such and such things must have happened to the Messiah; Jesus was the Messiah; therefore, such and such things happened to him” (Ibid, pp. 81, 82).  “It is not, however, to be imagined that any one individual seated himself at his table to invent them out of his own head, and write them down as he would a poem; on the contrary, these narratives, like all other legends, were fashioned by degrees, by steps which can no longer be traced; gradually acquired consistency, and at length received a fixed form in our written Gospels” (Ibid, p. 35).  From the considerations here adduced—­the lack of quotations from our Gospels in the earliest Christian writers, both orthodox and heretical; the accusations against each made by the other of introducing chants and modifications in the Gospels; the facility with which MSS. were altered before the introduction of printing; the coincidences between the Gospels, showing that they are drawn from a common source; from all these facts we finally conclude that there is no evidence that the Four Gospels mentioned about that date (A.D. 180) were the same as those we have now.