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.

7523. 'And there will be on man and on beast' means the products of interior and exterior evil. This is clear from the meaning of 'man' as the affection for good, and in the contrary sense as the desire for evil; and 'beast' is similar in meaning. But when 'man' and 'beast' are mentioned together, 'man means interior affection or desire and 'beast' exterior; regarding both, see 7424. Interior good or else interior evil, which is meant by 'man', is that connected with intentions or ends in view, for intentions or ends in view are at a person's core, whereas exterior good or else exterior evil, which is meant by 'beast', is that connected with thought and consequently, if nothing stands in the way, with action. Exterior good is meant by 'beast' because a person is in respect of his external or natural man no different from a beast; for he is endowed with similar desires and also cravings, as well as appetites and senses. And interior good is meant by 'man because it is in respect of his internal or spiritual man that a person is a human being, on which internal level he is endowed with affections for what is good and true such as exist with the angels in heaven, and because he controls his natural or animal man, which is 'a beast', by means of that internal man. Regarding the meaning of 'beast' as the affection for good and in the contrary sense the desire for evil, see 45, 46, 142, 143, 246, 714, 715, 719, 776, 2179, 2180, 3218, 3519, 5198.

[2] These things are what are meant by 'man and beast' in the following places too: In Jeremiah,

My anger and My wrath have been poured out on this place, on man and on beast. Jeremiah 7:20

In the same prophet,

I will strike the inhabitants of this city, both man and beast; they will die of a great pestilence. Jeremiah 21:6.

In the same prophet,

It will make her land a desolation, so that none may dwell in it; both man and beast have scattered themselves, they have gone away. Jeremiah 50:3.

In Ezekiel,

When a land has sinned against Me by committing great transgression, I will cut off from it man and beast. Ezekiel 14:13, 19, 21.

In the same prophet,

I will stretch out My hand over Edom, and cut off from it man and beast, and make it a waste. Ezekiel 25:13.

In Zephaniah,

I will consume man and beast, I will consume the birds of the air and the fish of the sea, and the stumbling-blocks with the wicked; and I will cut off man from the surface of the earth. Zephaniah 1:3.

[3] 'Man and beast' stands for interior and exterior good in the following places: In Jeremiah,

I have made the earth, man and beast, by My great strength. Jeremiah 27:5.

In the same prophet,

Behold, the days are coming, said Jehovah, in which I will sow the house of Israel and the house of Judah with the seed of man and the seed of beast. Jeremiah 31:17.

In the same prophet,

A desolation will the earth be, so that man and beast are not there. Jeremiah 32:43.

In the same prophet,

In the cities of Judah, and in the streets of Jerusalem, that have been devastated, there is no man and inhabitant, and there is no beast. Jeremiah 33:10; 51:62.

In David,

Your righteousness is like the mountains of God, Your judgements a great deep; You preserve man and beast, O Jehovah. Psalms 36:6.

It was because 'man and beast' meant such things that the firstborn of the Egyptians died, not only of men but also of beasts, Exodus 12:29, and that the firstborn were consecrated [to Jehovah], not only of men but also of beasts, Numbers 18:15, and also that the king of Nineveh, following sacred religious practice, commanded that not only man but also beast should fast and also be clothed in sackcloth, Jonah 3:7-8.