The apocalyptic prophet view primarily emphasizes Jesus preparing his fellow Jews for the End times. The works of E. P. Sanders and Maurice Casey place Jesus within the context of Jewish eschatological tradition. Bart Ehrman aligns himself with the century-old view of Albert Schweitzer that Jesus expected an apocalypse during his own generation, and he bases some of his views on the argument that the earliest gospel sources (for which he assumes Markan priority) and the First Epistle to the Thessalonians, chapters 4 and 5, probably written by the end of AD 52, present Jesus as far more apocalyptic than other Christian sources produced towards the end of the 1st century, contending that the apocalyptic messages were progressively toned down. Dale Allison does not see Jesus as advocating specific timetables for the End Times, but sees him as preaching his own doctrine of "apocalyptic eschatology" derived from post-exilitic Jewish teachings, sees the apocalyptic teachings of Jesus as a form of asceticism.