And said unto him, Run, speak to this young man, saying,
Jerusalem shall be inhabited as towns without walls because of the multitude of men and cattle in it:
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George Leo Haydock
Walls. This must be understood of the spiritual Jerusalem, the Church of Christ. (Challoner)
According to St. Augustine (in Psalm lxxi.) when the literal sense cannot be verified, we must have recourse to the thing prefigured; and thus what is here written, must be explained of the Church rather than of Jerusalem. (Worthington)
A little before the fall of the latter, it was become so populous that the houses which had been built without the walls were enclosed. (Josephus, Jewish Wars vi. 6.)
This multitude was a sort of pledge or figure of the crowds which should embrace the gospel.