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.

6110. 'For the famine was extremely serious' means desolation. This is clear from the meaning of 'famine' as an absence of good and of cognitions, dealt with in 1460, 3364, 5277, 5279, 5281, 5300, 5579, 5893, so that 'the famine was extremely serious' is desolation, 5360, 5376, 5415, 5576. As regards desolation, it should be recognized that truths and forms of good, together with cognitions of them, compose the spiritual life of those who are in heaven. They are the celestial and spiritual foods that nourish them; and these foods are given them every day by the Lord. When it is morning with them forms of good are supplied, and when it is midday truths are supplied; but when evening comes they lack them, and continue to lack them until it is twilight and then morning again. Their yearning when they lack them remains so strong that their desire for them is greater than starving people's desire for food on earth. This state is meant by 'the famine' and it is a kind of desolation, though not the kind experienced by those on the lower earth, 698, 699, 1106-1113.

[2] Scarcely anyone in the world can believe that the angelic heaven can have so great a yearning for truths and forms of good, and for cognitions of them. For people whose minds are set on nothing else than gain and glory, and who are given up to worldly pleasures, will be amazed to learn that those things constitute angelic life. 'What use they will say 'are cognitions of goodness and truth to me? What life can they give me? The things that bring me life and my life's delight are wealth, position, and worldly pleasures!' But let those who speak like this know that the life these things bring is that of the body, not that of the soul, and that the former kind of life perishes along with the body, whereas the latter kind remains for ever. Let them also know that people are ill-advised if while in the world they do not give any thought to spiritual life.

[3] Further as regards desolation, it exists on account of the yearning; for forms of good and truth are accepted in the measure that they are yearned for, and when the desires created by the yearning are fulfilled they produce feelings of happiness and bliss. In the next life therefore those who pass through desolation are refreshed immediately afterwards and realize their desires; everyone there is made more perfect by means of such alternating experiences. It is a fact worthy of note that the changing times of day in the natural world - morning, midday, evening, night, and morning again - are wholly representative of the changes that take place in the spiritual world, yet with one difference. The changes that occur in the spiritual world have an effect on the understanding and the will, establishing in them the basic elements of life, whereas the changes that occur in the world have an effect on and sustain things of the body.

[4] What is even more noteworthy is the fact that it is not the Lord who brings on the shades of evening and the darkness of night but those characteristics of angels, spirits, or men that are entirely their own. For the Lord as the Sun shines and flows in constantly; but because the evils and falsities that spring from what is his own are present in a man, spirit, or angel, they turn and direct him away from the Lord. In so doing they bring him into the shades of evening, and lead the wicked into the darkness of night. It is similar to the way things are with the sun in our world. It shines and flows in constantly, but the earth by rotating on its axis turns away from the sun and brings itself into shade and darkness.

[5] These features of the natural world come about because the natural world comes into being from the spiritual world and is also kept in being from there, as a consequence of which the entire natural system is a theatre representative of the Lord's kingdom, 3483, 4939. The purpose served by the changes that take place in the spiritual world is that all who are in heaven may constantly become more perfect. Such changes exist in the natural world for the same reason, for if they did not occur everything there would perish because of drought.

[6] It should be recognized however that in heaven there is no night, only evening, which is followed by the twilight that comes before morning; but in hell there is night. Changes take place there also, but they are of a contrary nature to those in heaven. In hell morning is the heat of evil desires, midday is the itch of false ideas, evening is anxiety, and night is torment. But through all these changes night predominates; merely variations of shade and darkness are what bring about those changes. In addition to this it should be recognized that in the spiritual world the changes which take place are not the same with one person as they are with another, also that the changes there do not divide into regular periods of time because they are variations of state that produce those changes. For instead of the periods of time that occur in the natural world there are states in the spiritual world, 1274, 1382, 2625, 2788, 2837, 3254, 3356, 4814, 4916, 4882, 4901.