"Since around 1970 an alternative explanation of the New Testament and related texts has been emerging. Researchers are recognizing precise ways in which New Testament texts are explained as depending not on oral tradition but on older literature, especially older scripture. [...] The dependence of the gospels on the Old Testament and on other extant texts is incomparably clearer and more verifiable than its dependence on any oral tradition — as seen, for instance, in the thorough dependence of Jesus’ call to disciples (Lk. 9:57-62) on Elijah’s call (1 Kgs 19). The sources supply not only a framework but a critical mass which pervades the later text."