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.

408. Once the Church has been so vastated that faith exists no longer a fresh start is made, that is, new light begins to shine, which in the Word is called 'the morning'. The reason new light or the morning does not shine before the Church has been vastated is that the things constituting faith and charity have been mingled with things that are unholy, and as long as they are mingled no light or charity can possibly be introduced, for tares are ruining all the good seed. But once faith is no more, it is no longer possible for faith to be profaned, since people do not believe what is said. People who do not acknowledge and believe something but merely know it are, as stated already, incapable of profaning it. A similar situation exists at the present time in the case of Jews who, because they live among Christians, cannot help knowing that the Lord is acknowledged by Christians to be the Messiah whom they, the Jews, have been waiting for and are awaiting still. Yet they are incapable of profaning because they do not acknowledge and believe these matters. Nor, in a similar way, can Moslems and gentiles who have heard about the Lord do so. This was the reason why the Lord did not come into the world until the Jewish Church had ceased to acknowledge and believe anything.