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.

1712. That 'he divided himself against them by night' means the shade which the apparent goods and truths were in is clear from the meaning of 'night' as a state of shade. It is called a state of shade when a person does not know whether good and truth are apparent or genuine. While a person is limited to apparent good and truth he imagines that these are genuine good and truth. It is the evil and falsity present in apparent good and truth that produce the shade and cause them to be seen as genuine. What else can people who are in ignorance know than that the good they do is their own, and that the truth they think is their own? The same applies to people who ascribe the good deeds they do to themselves and place merit in them, unaware of the fact that in this case those deeds are not good though they appear to be so, and that the proprium and the self-merit they place in them are evils and falsities that cause obscurity and darkness. And the same applies in many other instances.

[2] What evil and falsity are like, and how much evil and falsity lie concealed in such deeds, cannot possibly be seen so clearly in the life of the body as in the next life, where these are presented to view altogether as in broad daylight. But it is different if a person acts out of ignorance that has not been confirmed, for in that case those evils and falsities are easily dispersed. But if people confirm themselves in the notion that they are able to do good and to withstand evil by their own powers, and that thus they merit salvation, such a notion remains attached, and causes the good to be evil, and the truth to be falsity. Yet for all this, order requires that a person should do good as though from himself, and ought not therefore to stay his hand and think to himself, 'If I am unable to do anything good at all from myself I must wait for immediate influx' and so remain inactive. This is also contrary to order. Man ought to do good as though from himself; but when he stops to reflect on the good he is doing or has done, let him think, acknowledge, and believe that the Lord present with him has accomplished it.

[3] If by thinking as described he gives up acting as of himself he is not a subject into whom the Lord can operate. The Lord cannot flow into anyone who deprives himself of everything into which power has to be introduced. He is like someone who is not willing to learn anything except through a revelation made to him; or like someone who is not willing to teach anything unless the words are put into his mouth; or like someone who is unwilling to attempt anything unless he is directed as one without a will. But if this were done he would be more indignant still at being like an inanimate object. In fact however that which is animated by the Lord in a person is the very thing which makes it seem as though it were from himself. That man does not live from himself is an eternal truth; yet if he did not appear to do so he could not possibly live at all.