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.

9061. 'He shall send him away free for the eye' means that it cannot serve the internal man any longer. This is clear from the meaning of 'sending away free' as releasing from service; and from the meaning of 'for the eye which he had destroyed in the slave' as because of the truth of faith that has been wiped out in the external or natural man. For 'the eye' means the understanding part of the mind and therefore the truth of faith, 9051, 9058; 'destroying' means wiping out, 9060; and 'male slave' means the external or natural man, 9058. The nature of all this cannot be known by anyone unless he knows about the nature of the internal man's relationship with the external man. The internal man cannot live a spiritual life unless the external man is in agreement, which being so a person cannot be regenerated unless the natural man also is regenerated. From this it follows that if the truth of faith in the natural or external man has been wiped out the latter cannot serve the internal man any longer.

[2] It is like the relationship between outward sight and inward sight. If outward sight has been impaired it can no longer serve inward sight; for if objects are distorted by outward sight, internal sight can gain only a distorted vision by means of it. Or it is like the situation with all other parts of the body that are controlled by the will, such as the arms, hands, fingers, and feet. If these are deformed, then the will can perform only clumsy actions by means of them. It is similar with the natural or external man's service to the internal man. If the factual truths in the external or natural man have been distorted or wiped out, the internal man cannot see the truth, and so cannot think about it and perceive it except in a distorted or false manner. From all this it is evident why the natural man must be regenerated if a person is to be regenerated. On these matters see also what has been shown previously in 3286, 3321, 3469, 3493, 3573, 3620, 3623, 3679, 4588, 4618, 4667, 5165, 5168, 5427, 5428, 5477, 6299, 6564, 8742-8747, 9043.