Professor James Kugel of Bar-Ilan University wrote that Gunkel's concept of the etiological tale led 20th century scholars to understand the stories of the rivalry of Jacob and Esau in and to explain something about the national character (or national stereotype) of Israel and Edom at the time of the stories’ composition, a kind of projection of later reality back to the "time of the founders." In this etiological reading, that Esau and Jacob were twins explained the close connection between Edom and Israel, their similar dialects, and cultural and kinship ties, while the competition between Esau and Jacob explained the off-and-on enmity between Edom and Israel in the Biblical period. Kugel reported that some biblical scholars saw an analogue in Israelite history: Esau's descendants, the Edomites, had been a sovereign nation while the future Israel was still in formation (see ), making Edom the "older brother" of Israel. But then, in the 10th century BCE, David unified Israel and conquered Edom (see and ), and that is why the oracle gave Rebekah during her pregnancy said that "the older will end up serving the younger." Kugel reported that scholars thus view the stories of the young Jacob and Esau as created to reflect a political reality that came about in the time of David, indicating that these narratives were first composed in the early 10th century BCE, before the Edomites succeeded in throwing off their Israelite overlords, at that time when Israel might feel "like a little kid who had ended up with a prize that was not legitimately his." When Edom regained its independence, the stolen blessing story underwent a change (or perhaps was created out of whole cloth to reflect Edom's resurgence). For while Israel still dominated Edom, the story ought to have ended with Isaac's blessing of Jacob in But Isaac's blessing of Esau in "By your sword you will live, and you will indeed serve your brother; but then it will happen that you will break loose and throw his yoke from off your neck," reflects a reformulation (or perhaps new creation) of the story in the light of the new reality that developed half a century later.