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17 And God set them in the firmament of the heaven to give light upon the earth,
'A sandal tree' signifies aspects of the natural self.
(Notae: Apocalypse Explained 518)
18 It will happen in that day, that the mountains will drop down sweet wine, the hills will flow with milk, all the brooks of Judah will flow with waters, and a fountain will come forth from the house of Yahweh, and will water the valley of Shittim.