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.

714. That 'every clean beast' means affections for good is clear from what has been stated and shown already about beasts in 45, 46, 142, 143, 246. The reason affections are meant by this is that a human being regarded in himself and his proprium is no different from a beast. His [five] senses are very similar, appetites very similar, natural desires very similar, as well as all his affections being very similar. His good and even his best loves are very similar, such as loving companions of his own species, loving his offspring, and loving his married partner. To this extent there is no difference at all. He is a human being and superior to beasts however in that he has an inner life which neither does nor can exist with beasts. That life is the life of faith and love deriving from the Lord, and unless that life were present in the smallest characteristic which a human being shares in common with beasts he would not be in any way different. Take just one example - love towards companions. If he were to love them merely for his own sake without anything more heavenly or more divine within such love, he could not then be called a human being, for the same is true of beasts. Similarly with every other example that could be taken. Consequently if the life of love from the Lord were not present in his will, and the life of faith from the Lord in his understanding, he would in no way be human. Through the life he has from the Lord he lives on after death, for the Lord takes him to Himself; and in this way he can be with angels in His heaven and live for ever. And even when someone lives like a wild animal, loving nothing whatever but himself and things regarding himself, still the Lord's mercy, being Divine and Infinite, is so great that He does not abandon him but by means of angels continually breathes His life into him. And even though someone does not receive that life otherwise than as a wild animal the Lord still makes it possible for him to think, reflect, and understand whether something in private or public life, or something worldly or bodily is good or bad, and so whether it is true or false.