When Rabbi Yehoshua of Kutna returned from his journey to the Holy Land, his townspeople asked him what he saw there.

"I found the land desolate," he replied. "Jerusalem is in ruins, and of our glorious Temple, only a humble stone wall remains standing. But there is one thing that has survived intact - one thing that exists in the Holy Land exactly as it did in the days of the Temple."

"And what is that?" they asked.

"Baseless hatred and animosity among Jews," said Rabbi Yehoshua, "which, as the Talmud recounts,[1] was the cause of the Destruction. That has remained unchanged."

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[1] Talmud, Yoma 9b.