Plain
'A plain' signifies the extremes of the Word regarding doctrine, and also the extremes of the church, or people in extremes of truths and goods. It also signifies good and truth in the natural self, because 'the people who dwell in plains,' or 'beneath mountains and hills' are in the extreme heaven. In Genesis 19:17, this signifies all doctrinal matters.
In Genesis 11:2, this signifies that their worship became more impure and profane. (Arcana Coelestia 1292)
In Jeremiah 21:13, this signifies the faith in which is no charity. (Arcana Coelestia 4715) Plain and valley signifies the ultimates of the Word. (Apocalypse Explained 411) Plain signifies good and truth in the natural man, because people in the First Heaven dwell in plain or valley. (Apocalypse Explained 449)
(References: Apocalypse Explained 400)
Revelation 20:7-9
7
And after the thousand years, Satan will be released from his prison,
8
and he will come out to deceive the nations which are in the four corners of the earth, Gog and Magog, to gather them together to the war; the number of whom is as the sand of the sea.
9
They went up over the breadth of the earth, and surrounded the camp of the saints, and the beloved city. Fire came down out of heaven from God, and devoured them.
