Synoptic Gospels texts of the three synoptic gospels often agree very closely in wording and order, both in quotations and in narration. Most scholars ascribe this to "documentary dependence", direct or indirect, meaning the close agreements among synoptic gospels are due to one gospel's drawing from the text of another, or from some written source that another gospel also drew from. The synoptic problem hinges on several interrelated points of controversy: Furthermore, some theories try to explain the relation of the synoptic gospels to John; to non-canonical gospels such as Thomas, Peter, and Egerton; to the Didache; and to lost documents such
Synoptic Gospels eighteenth century, when Johann Jakob Griesbach published in 1776 a "synopsis" of the synoptic gospels. Instead of harmonizing them, he displayed their texts side by side, making both similarities and divergences apparent. Griesbach, noticing the special place of Mark in the synopsis, hypothesized Marcan posteriority and advanced (as Henry Owen had a few years earlier) the two-gospel hypothesis (Matthew–Luke). In the nineteenth century, researchers applied the tools of literary criticism to the synoptic problem in earnest, especially in German scholarship. Early work revolved around a hypothetical proto-gospel ("Ur-Gospel"), possibly in Aramaic, underlying the synoptics. From this line of inquiry, however,