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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)
1 Ephraim feeds on wind, and chases the east wind. He continually multiplies lies and desolation. They make a covenant with Assyria, and oil is carried into Egypt.