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.

862. We have said that the nations' surrounding the camp of the saints and the beloved city means, symbolically, that these people attempted to destroy everything connected with the New Church, both its truths and goods and its fundamental doctrine regarding the Lord and life, as stated in the preceding number. This is the symbolic meaning because the camp of the saints symbolizes all the truths and goods of the church which is the New Jerusalem.

That a camp in the spiritual sense symbolizes everything connected with the church with respect to its truths and goods can be seen from the following passages:

The sun and moon grew dark, and the stars diminished their brightness. Jehovah uttered His voice before His army, for His camp is very great; for numberless are those who obey His Word. (Joel 2:10-11)

I will encamp for My house some of the army... (Zechariah 9:8)

...God has scattered the bones of them who encamp against you..., because God has rejected them. (Psalms 53:5)

The angel of Jehovah encamps all around those who fear Him, and delivers them. (Psalms 34:7)

(An angel of God met Jacob, and said to Jacob,) "This is God's camp." Therefore he called the name of that place Mahanaim (Two Camps). (Genesis 32:1-2)

And so on elsewhere, as in Isaiah 29:3, Ezekiel 1:24, Psalms 27:3.

That an army or host in the Word symbolizes the church's truths and goods, and also its falsities and evils, may be seen in nos. 447, 826, 833; and so, too, does a camp.

[2] Since the children of Israel and their twelve tribes symbolize the church in respect to all its truths and goods (nos. 349, 350), they were therefore called the armies or hosts of Jehovah (Exodus 7:4; 12:41, 51), and the places where they stopped and assembled were called camps, as in Leviticus 4:12; 8:17; 13:46; 14:8; 16:26, 28; 24:14, 23; Numbers 1; 2; 3; 4:5 ff., 5:2-4; 9:17-23; 10:1-10, 11-28; 11:31-32; 12:14-15; 21:10-15; 33:1-49; Deuteronomy 23:9-14; Amos 4:10.

It is apparent from this now that the nations' surrounding the camp of the saints and the beloved city means, symbolically, that these people tried to destroy all the truths and goods of the New Church, which is the New Jerusalem, and also its doctrine regarding the Lord and life.

The same symbolism is found in these verses in Luke:

When you see Jerusalem surrounded by armies, then know that its desolation is near... (At length) Jerusalem will be trampled by Gentiles until the times of the Gentiles are fulfilled. (Luke 21:20, 24)

This is said in reference to the end of the age, which is the final period of the church. Jerusalem here also symbolizes the church.

That Gog and Magog, that is, people who engage in external worship divorced from any internal worship, will then invade the church and try to destroy it, is something we are told also in Ezekiel 38:8-9, 11, 12, 15, 16, 39:2, and that the New Church will then be established by the Lord, Ezekiel 39:17-29.