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.

934. Standing by the glassy sea, signifies because they have been in truths from the Word. This is evident from the signification of "the glassy sea," as being the generals of truth from the Word transparent from spiritual truths (See above, n. 931); so "standing by it" signifies to be in truths. They were seen "standing by the glassy sea" because those who live the life of charity and reject the doctrine of faith separated remain in the truths of the sense of the letter of the Word, and do not pervert and falsify them. As for example, where "doing" and "working," also "deeds" and "works" are mentioned in the Word they do not include these in faith as though they were concealed in it, but they actually will and do them; for they know that without them faith is not faith, and that faith is only so far faith as works are rightly conjoined with it; consequently to include these in faith or to separate them from it they condemn as a heresy. This makes clear that such "stand by the glassy sea," that is, are in truths from the Word.

[2] It was said of works in the preceding article that those done by man are not good, but only those done by the Lord with man. But for works to be done by the Lord, and not by man, two things are necessary: first, the Lord's Divine must be acknowledged, also that He is the God of heaven and earth even as to the Human, and that every good that is good is from Him; and secondly, that man must live according to the commandments of the Decalogue by abstaining from those evils that are there forbidden, that is, from worshiping other gods, from profaning the name of God, from thefts, from adulteries, from murders, from false witness, from coveting the possessions and property of others. These two things are requisite that the works done by man may be good. The reason is that every good comes from the Lord alone, and the Lord cannot enter into man and lead him so long as these evils are not removed as sins; for they are infernal, and in fact are hell with man, and unless hell is removed the Lord cannot enter and open heaven. This is what is meant by the Lord's words to the rich man:

Who asked Him about eternal life, and said that he had kept the commandments of the Decalogue from his youth; whom the Lord is said to have loved, and to have taught that one thing was lacking to him, that he should sell all that he had and take up the cross (Matthew 19:16-22; Mark 10:17-22; Luke 18:18-23).

"To sell all that he had" signifies that he should relinquish the things of his religion, which were traditions, for he was a Jew, and also should relinquish the things that were his own [proprium], which were loving self and the world more than God, and thus leading himself; and "to follow the Lord" signifies to acknowledge Him only and to be led by Him; therefore the Lord also said, "Why callest thou Me good? there is none good but God only." "To take up his cross" signifies to fight against evils and falsities, which are from what is one's own [proprium].