Biblical Literature, The two- and four-source hypotheses

The two-source hypothesis is predicated upon the following observations: Matthew and Luke used Mark, both for its narrative material as well as for the basic structural outline of chronology of Jesus' life. Matthew and Luke use a second source, which is called Q (from German Quelle, �source�), not extant, for the sayings (logia) found in common in both of them. Thus, Mark and Q