238. Verse 6. And before the throne there was a sea of glass like unto crystal, signifies the New Heaven from Christians who are in general truths from the literal sense of the Word. In the spiritual world there appear atmospheres, and also waters, like as in our world; the atmospheres, in which the angels of the highest heaven dwell, are as it were ethereal; the atmospheres, in which the angels of the middle heaven dwell, are as it were aerial; and the atmospheres, in which the angels of the lowest heaven dwell, are as it were aqueous; and these last appear as seas at the boundaries of heaven, where they dwell who are in general truths from the literal sense of the Word. That "waters" signify truths, may be seen above (n. 50); hence "the sea," in which waters terminate and are collected, signifies the Divine truth in its boundaries. Since, therefore, by "One sitting on the throne" is meant the Lord (n. 230), and by "the seven lamps," which are "the seven spirits of God before the throne," is meant the New Church, which will be in Divine truth from the Lord (n. 237), it is evident that, by "the sea of glass" which was before the throne, is meant the church among those who are at the boundaries.
 It has also been granted me to see the seas which are at the boundaries of the heavens, and to converse with those who were therein, and thus to know the truth of this matter from experience. They seemed to me to be in the sea, but they said that they are not in the sea, but in an atmosphere; from which it was manifest to me, that the sea is an appearance of the Divine proceeding from the Lord in its boundaries. That there are seas in the spiritual world, is fully evident from their having been seen by John frequently (as also here, in chap. 5:13; 7:1-3; 8:8, 9; 10:2, 8; 12:12; 13:1; 14:7; 15:2; 16:3; 18:17, 19, 21; 20:13). It is called "a sea of glass like unto crystal," from the pellucidity of the Divine truth proceeding from the Lord.
 Because Divine truth at its boundaries causes the appearance of a sea in the spiritual world, therefore "sea," in other parts of the Word, has a similar signification, as in these passages:
In that day living waters shall go forth from Jerusalem, part of them toward the eastern sea, and part of them toward the hinder sea (Zech. 14:8).
"Living waters from Jerusalem," are the Divine truths of the church from the Lord, therefore "the sea" is where they terminate:
Thy way, O Jehovah, is in the sea, and Thy highway in many waters (Ps. 77:19).
Thus saith Jehovah, which maketh a way in the sea, and a highway in many waters (Isa. 43:16).
Jehovah hath founded the world upon the seas, and established it upon the floods (Ps. 24:2).
Jehovah hath founded the earth upon its bases that it should not be removed to eternity. Thou coveredst it with the deep [or sea] as with a garment (Ps. 104:5, 6).
"The earth is founded upon the sea," is the church, which is meant by "the earth," is founded upon general truths; for these are its bases and foundations.
 And I will dry up the sea of Babylon and make her springs dry; He shall make the sea to ascend over Babylon, she shall be covered with the multitude of the waves (Jer. 51:36, 42).
"Drying up the sea of Babylon and making her springs dry," signifies to extinguish every truth of its church from firsts to lasts.
They shall walk after Jehovah, then the sons shall approach with honor from the sea (Hos. 11:10).
"Sons from the sea" are they who are in general or ultimate truths.
Jehovah who buildeth His steps in the heavens, and calleth for the waters of the sea, and poureth them out upon the faces of the earth (Amos 9:6).
By the word of Jehovah were the heavens made, He gathereth the waters of the sea together as a heap, giving the abysses in treasuries (Ps. 33:6-7).
At My rebuke I dry up the sea, I make the rivers a wilderness (Isa. 50:2: besides in other places).
 As by "sea" is signified the Divine truth with those who are in the borders of heaven, therefore by "Tyre and Zidon," from their being near the sea, is signified the church as to the knowledges of good and truth; and also by the "islands of the sea" are signified those who are in more remote Divine worship (n. 34): and therefore "the sea," in the Hebrew language, is called "the west," that is, where the light of the sun declines towards its evening, or truth into obscurity. That "sea" also signifies the natural of man separated from the spiritual, thus also hell, will be seen in what follows.