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.

5293. 'And let them gather all the food' means all things that have a useful purpose. This is clear from the meaning of 'gathering' as drawing together and preserving; and from the meaning of 'food' as things which have a useful purpose. In the internal sense 'food' means, strictly speaking, those things which nourish a person's soul, that is, which nourish him when his bodily life is ended. For when this is ended his soul or spirit is living, and he no longer needs material food as he did in the world; but he does need spiritual food, which consists in everything that has a useful purpose and everything leading to this. That which leads to what has a useful purpose is knowing what goodness and truth are; and that which has such a purpose is the desire to realize these in actions. These are the things with which angels are nourished and which are therefore called spiritual and celestial foods. A person's mind - the place within him where his will and understanding, that is, his intentions or ends in view, reside - is nourished by no other kind of food, even while he lives in the body. Material food does not extend as far as that; it extends only to his bodily parts, which are sustained by that material food to the end that the mind may be sustained by food for the mind while the body is sustained by food for the body, that is, to the end that there may be a healthy mind in a healthy body.

[2] The reason 'food' in the spiritual sense means everything that has a useful purpose is that a person's entire knowledge, his entire understanding and wisdom, and so his entire will must have a useful purpose as its end in view. Consequently as is the nature of the purpose he has in view, so is the nature of his life. The truth that 'food' in the spiritual sense means everything with a useful purpose is evident from the following words spoken by the Lord,

Jesus said to the disciples, I have food to eat of which you do not know. The disciples said to one another, Has anyone brought Him anything to eat? Jesus said to them, My food is to do the will of Him who sent Me, and to accomplish His work. John 4:32-34.

And elsewhere,

Do not labour for the food which perishes, but for the food which endures to eternal life, which the Son of Man will give you. On Him the Father - God - has set His seal. John 6:27.