Mark is the shortest of the four gospels with only 661 verses, but 600 of those verses are in Matthew and 350 of them are in Luke. Some of these verses are verbatim. Most scholars agree that this indicates Mark was a source for Matthew and Luke. There is also some verbatim agreement between Matthew and Luke of verses not found in Mark. In 1838, the religious philosopher Christian Hermann Weisse developed a theory about this. He postulated a hypothetical collection of the sayings of Jesus from an additional source called Q, taken from "Quelle", which is German for "source".