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14 And God said, Let there be lights in the firmament of the heaven to divide the day from the night; and let them be for signs, and for seasons, and for days, and years:
'A sandal tree' signifies aspects of the natural self.
(Reference: Apocalypse Explained 518)
14 But I will kindle a fire in the wall of Rabbah, and it will devour its palaces, with shouting in the day of battle, with a storm in the day of the whirlwind;