"But the nomads were the terror of all those whom the soil or the advantages of the market had induced to build towns. Agriculture therefore was a religious injunction, because of the perils of the state from nomadism."

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Cities originally surrounded by a wall can produce an urban population cut off from the surrounding fields and from agriculture altogether. At the same time, the greenbelt laws eliminate the possibility of the unchecked expansion of a city into a monstrous megalopolis. If there is a need for additional homes, a new city must be established.

— Yehuda Levi