Thanks for that link.
Excerpt:
Because our (Jewish) tradition of Satan is more impressionistic than the character who appeared later under Christian narratives, I felt that “Satan” was not sufficient to explain fully the inexplicable, immediate mirror-imaging of what had been our society, from ordered at least on the presumption of morality, to being ordered around death and cruelty. But I did not at that time have a better concept with which to work.