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6 And God said, Let there be a firmament in the midst of the waters, and let it divide the waters from the waters.
In Psalm 71,72, this signifies the celestial man. (Arcana Coelestia 337[2])
1 The earth is Yahweh's, with its fullness; the world, and those who dwell therein.
2 For he has founded it on the seas, and established it on the floods.