The origin of the story “that which is hateful to you...” was an answer that Rabbi Hillel gave to a brash person who demanded that he be taught the entire Torah “on one foot.”
That that Christianity holds itself as more moral or loving by calling its credo “love thy neighbor” means only that you chose to highlight that difference. (they are anti-hero, we Christians are pro-love.)
It’s a relative ‘feel good’ however, as Jews say, viahavta l’reyacha kamocha, love your neighbor as yourself. From where did JC learn such a thing?
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Here's a good joke-
A rabbi once asked his old friend, a priest, "Could you ever be promoted within your Church?"
The priest says, thoughtfully, "Well, I could become a bishop."
The rabbi persists, "And after that?"
With a pause for consideration, the priest replies, "Maybe I could be a cardinal, even."
"And then?"
After thinking for some time, the priest responds, "Someday I may even rise to be the Pope."
But the rabbi is still not satisfied. "And then?"
With an air of incredulity, the priest cries, "What more could I become? God Himself?"
The rabbi says quietly, "One of our boys made it."