In chapter 4 of the Book of Amos, verses 1-3 are talking about people who pervert the truths of the church. They will fall into falsities in outermost things.

In the Bible, fish represent "lower" things than mammals, so we can interpret the fishhooks in verse 2 as meaning being caught and held fast in natural or lower things.

Verses 4-6 are about acts of worship such as tithes and sacrifices. These look similar to genuine worship, but are only external sorts of things. We can tell because ‘teeth’ (in verse 6) represent ultimates or outermost things (see Secrets of Heaven 6380). It follows that “cleanness of teeth” would mean outermost things that look good but only imitate genuine worship. The Lord exhorts, “Yet you have not returned to me.”

Verses 7-8. Some things true will remain, when where there are too many false ideas, the truths don't get through. This can be seen where the Lord says, “I made it rain on one city; I withheld rain from another city... where it did not rain the part withered.” Again the Lord exhorts, “Yet you have not returned to me.”

Verse 9. Afterward all things of the church are falsified, shown by blight attacking the gardens, vineyards, fig tree and olive trees. The last three represent spiritual, natural and celestial things, or all the things of spiritual life. “Yet you have not returned to me,” says the Lord.

Verses 10-11. The Lord explains the devastating things he allowed to happen: plague in Egypt, death of young men by swords, stench in the camps, Sodom and Gomorrah. This is because they are profaned by sensual knowledges. Profanation means the mixing of good and evil together. (See Secrets of Heaven 1001[2]).

This extends to all things of the church, with the church being the Lord’s kingdom on earth (Secrets of Heaven 768[3]).

With profanation “as soon as any idea of what is holy arises, the idea of what is profane joins immediately to it,” (Secrets of Heaven 301).

Now there is hardly anything left. “Yet you have not returned to Me,” says the Lord again.

Verses 12-13: Because people adamantly remain in their profane ways, they are warned, “Prepare to meet your God!”. This is the God powerful and mighty, “who forms mountains, and creates the wind,” and even more close to home, “Who declares to man what his thought is.” As intimately a knowing as that is, the Lord’s love for all humanity is contained in His exhortations for them to turn themselves to Him.

See, for example, Luke 6:44-45, and True Christian Religion 373.

100. And hast tried them that say that they are apostles and they are not, and hast found them liars, signifies also falsities, so far as they are able to search them out. This is evident from the signification of "to try," as being to inquire into and search out; and from the signification of "apostles," as being those who teach the truths of the church, and in a sense abstracted from persons, the truths themselves that are taught (of which in what follows); also from the signification of "and are not, and are found liars," as being not truths but falsities; for a "lie" and a "liar" signify falsity (Arcana Coelestia 8908, 9248). From this and what precedes it is evident that "I know that thou canst not bear the evil, and hast tried them that say they are apostles and they are not, and hast found them liars," signifies that they reject evils, and falsities also, so far as they are able to search them out. For in the things written to this church those who are in the knowledges of truth and good, thus in the knowledges of such things as are of heaven and of the church, are treated of (See above, n. 93); here, therefore, it is first said of them that they put away evils, and falsities also, so far as they are able to search them out; for those who are in the knowledges of the holy things of the church need first to know in general what good and truth are, also what evil and falsity are, for upon this knowledge all other knowledges are founded. (For this reason also The Doctrine of the New Jerusalem first of all treats of Good and Truth, n 11-27, and from these it can also be seen what evil and falsity are.)

[2] By "apostles" those who teach the truths of the church are signified, because the apostles [those sent] were so called from their having been sent to teach and to preach the Gospel concerning the Lord and the drawing nigh of the kingdom of God through Him; thus to teach the truths of the church, by which the Lord is known and the kingdom of God is brought nigh. The kingdom of God on the earth is the church. From this it is evident what is meant by "apostles" in the spiritual sense of the Word, namely, not the twelve apostles who were sent by the Lord to teach concerning Him and His kingdom, but all who are in the truths of the church, and in a sense abstracted from persons, the truths themselves. For in the Word it is customary to speak of persons; but those who are in its spiritual sense, as angels are, do not think of persons at all, but their thought is abstracted from persons, and has respect therefore solely to things. The reason is, that it is material to think of persons, but spiritual to think apart from the idea of persons; for instance, where the "disciples" are mentioned in the Word, or "prophets," "priests," "kings," "Jews," "Israel," "the inhabitants of Zion," and of "Jerusalem," and so on. (Moreover, the very names of persons and places are changed with angels into things, see Arcana Coelestia 768, 1224, 1264, 1876, 1888, 4310, 4442, 5095, 5225, 6516, 10216, 10282, 10329, 10432; and that the thought of angels is abstracted from persons, n. 8343, 8985, 9007)

[3] That the disciples of the Lord were called apostles from their having been sent to teach concerning Him and His kingdom is clear in Luke:

Jesus sent His twelve disciples to preach the kingdom of God. And the apostles, when they were returned, declared unto Him what things they had done. And Jesus spake to them of the kingdom of God (Luke 9:1-2, 9:10-11).

In the same:

When it was day, Jesus called His disciples; and He chose from the twelve, whom also He named apostles (Luke 6:13).

In the same:

I will send unto them prophets and apostles, and some of them they shall kill and persecute (Luke 11:49).

They are called "prophets and apostles," because by "prophets," as well as by "apostles," are meant those who were sent to teach truths; but by "prophets" those of the Old Testament, and by "apostles" those of the New. (That "prophets" in the Word signify those who teach truths and in a sense abstracted from persons the truths themselves, see Arcana Coelestia 2534.) As the "twelve apostles" signify the truths themselves of the church, it is said in Revelation:

The wall of the New Jerusalem had twelve foundations, and in them the names of the twelve apostles of the Lamb (Revelation 21:14).

(That by the "New Jerusalem" is meant the church in respect to doctrine, see in the small work on The New Jerusalem and its Doctrine 6 ; that by its "wall" are signified the truths of doctrine for defense, see Arcana Coelestia 6419; by the "foundations of the wall" are signified the knowledges of the truth, on which doctrine is founded, n. 9643; by "twelve" are signified all truths in the complex, n. 577, 2089, 2129-2130, 3272, 3858, 3913. From this it is clear why it is said that in the foundations of the wall were the "names of the twelve apostles of the Lamb.")