931. Verse 2 (Revelation 15:2). And I saw as it were a glassy sea mingled with fire, signifies the generals of truth in the Word, transparent from spiritual truths, which are from the good of love. This is evident from the signification of "a glassy sea," as being generals of truth transparent from spiritual truths (See above, n. 275); also from the signification of "fire," as being the good of love (See n. 68, 496, 504, 916). It shall be told here briefly why "a glassy sea" signifies the generals of truth in the Word transparent from spiritual truths. The "sea" signifies truths in general, because "waters, fountains, and rivers," signify truths from which intelligence is derived, and the sea is their general receptacle. Truths in general, or the generals of truth, are such truths as are in the sense of the letter of the Word, and the sense of the letter of the Word is natural, and everything natural is a general receptacle of spiritual things. For nothing in the nature of the world, or nothing natural, is possible that does not exist from the spiritual; for the natural is formed from the spiritual, as an effect out of its effecting cause. And as thousands of things that are spiritual effect and form one natural thing, so this one, as it is the containant of the thousands, is a general thing.

[2] Such also is the Word in the sense of the letter in its relation to the Word in the spiritual sense; and as the spiritual sense of the Word is in the natural sense, and in it shines through before the angels, so the Word as to the generals of truth transparent from spiritual truths is signified by "the glassy sea." "Glassy sea" has the same signification elsewhere in Revelation:

And in sight of the throne a glassy sea like crystal (Revelation 4:6).

Also:

The city New Jerusalem, as well as the street of the city, appeared like pure gold, similar to transparent glass (Revelation 21:18, 21).

For that "city" signifies the doctrine of the church, and "street" the truth of that doctrine; and the truths of that doctrine, because they are genuine truths, derive their light and their transparency from spiritual truths. It is this transparency that is signified by "glass" and by "crystal":

Also over the heads of the cherubim a firmament was seen like the appearance of a wonderful crystal (Ezekiel 1:22).

This signifies the spiritual Divine in heaven. That "the glassy sea" signifies the Word in the sense of the letter transparent from its spiritual sense can be seen also from the fact that near it were seen "them that had the victory over the beast;" and these signify those who have not falsified the Word, and have not extinguished thereby the light of the spiritual sense.

496. Verse 5. And the angel took the censer and filled it from the fire of the altar, signifies the conjunction of celestial love and spiritual love. This is evident from the signification of a "censer," as being spiritual good (of which above, n. 491, and therefore also spiritual love, since all good is of love; also from the signification of "the fire of the altar," as being celestial love, for "fire" signifies in the Word love in both senses, namely, celestial love and infernal love. "The fire of the altar" signifies celestial love, because the altar of burnt-offering, upon which was the fire, was the chief representative of the worship of the Lord from that love (See above, n. 490); and because this love of the Lord is perpetual, therefore it was appointed that a fire should burn continually upon the altar, and that they should take of that fire in the censers for burning incense, which was done to represent the conjunction of celestial love with spiritual love.

[2] That a fire should burn continually upon the altar is evident from Moses:

And the fire upon the altar shall be kept burning, and shall not be put out; and the priest shall kindle wood on it every morning, and shall arrange on it the burnt-offering and he shall burn on it the fats of the peace-offerings. The fire shall be kept burning continually upon the altar, it shall not be quenched (Leviticus 6:12, 13).

This represented that the Lord's Divine love is unceasing and eternal.

[3] That they should take from the fire of the altar in the censers for burning incense see also in Moses:

Aaron shall take burning coals of fire from off the altar before Jehovah in a censer; and he shall put the incense upon the fire before Jehovah (Leviticus 16:12, 13).

And that Aaron took fire from off the altar, and put incense on it, by which expiation was made for the people (Numbers 16:46, 47).

This represented that all propitiation and expiation were from the Lord's Divine love, as also that everything that has that love in it is heard and received by the Lord; and the rising of the smoke of the incense represented also hearing and reception.

[4] And because Korah, Dathan, and Abiram and their company, took fire from the altar and burned incense, and thence their censers were sanctified:

It was commanded that after they had been swallowed up by the earth, their censers, which were of brass, should be gathered up, and the fire be scattered yonder, and the censers be beaten into plates for covering the altar (Numbers 16:36-39).

This also represented the holiness of the Lord's Divine love. And as incense-offerings were holy from the fire of the altar, so incense-offerings with strange fire were profane, therefore:

Nadab and Abihu, the sons of Aaron, were consumed by fire from heaven, because they offered incense with strange fire (Leviticus 10:1, 2).

Incense offering from strange fire represented worship from love other than Divine, and worship from any other love is profane.

[5] These passages have been cited to make known that "the fire of the altar" signifies the Lord's Divine love, which love in heaven is called Divine celestial love and Divine spiritual love; Divine celestial love is in the Lord's celestial kingdom, and Divine spiritual love is in the Lord's spiritual kingdom. For there are two kingdoms, into which all the heavens are divided, the celestial kingdom and the spiritual kingdom; Divine celestial love constitutes the celestial kingdom, and Divine spiritual love the spiritual kingdom. (That all the heavens are divided into these two kingdoms, see in the work on Heaven and Hell n.20-28; and that these two loves constitute these two kingdoms, or all the heavens, n. 13-19.) But it must be noted that the Lord's Divine love in the heavens is called celestial and spiritual from its reception by the angels, and not from its being divided in itself; also that spiritual love springs from celestial love as an effect from its effecting cause, and as truth from good; for the good of spiritual love is in its essence the truth of the good of celestial love. For this reason these two kingdoms are conjoined with each other and are one in the Lord's sight. But this has been said for those who love to search into interior things. That "fire" signifies love in both senses will be seen confirmed from the Word in what follows.