All the earth. — In accordance with the context, we can only understand this in the sense of “all the land” (Zechariah 13:8). But though this is undoubtedly the meaning of the prophet, there is no reason why his words may not have a wider application than he himself ever contemplated.
Shall there be one Lord. — Better, Jehovah shall be One: i.e., “God shall be all in all.”
And his name one. — i.e., and He alone shall be worshipped as God.