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.

9216. 'In which he may sleep' means resting on them. This is clear from the meaning of 'sleeping' as resting, in this instance on the external and sensory level, meant by 'clothing', 9212; for it says that it is clothing 'in which he may sleep'. How the explanation that more internal things find rest on the sensory level should be understood must be stated. The sensory level is the last and lowest of a person's life, as has been shown above. What is lowest contains all the more internal levels and is general to them all; for they terminate in it and accordingly rest on it. It is like the skin, for example, which is the outermost covering of the body. The body and all things in it terminate in the skin, because it contains them and they accordingly rest on the skin. In a similar way it is like the peritoneum within the body. Because it contains the abdominal organs, these rest on it and are also linked to it all round. Or equally it is like the pleura's relationship to the organs in the chest.

[2] A similar situation exists with all the things that compose a person's actual life, with those for instance that are connected with his understanding and those that are connected with his will. These too follow one another in order from more internal things to relatively external ones. The relatively external ones are factual knowledge together with its delights, while the outermost things are those of the senses, which are in contact with the world through sight, hearing, taste, smell, and touch. The more internal things rest on them since they terminate in them. These are the matters that are meant in the spiritual sense by 'the covering' or 'the clothing in which he may sleep'. The reason why things on the level of the senses are meant by 'the clothing' or 'the covering' lies in correspondences; for as stated above in 9212, spirits and angels appear dressed in garments in keeping with their truths of faith. Those governed by truths springing from good appear in shining ones, as for instance those at the Lord's tomb did, Luke 24:4; Matthew 28:3, and also in ones of fine, white linen, as for instance those referred to in Revelation 19:14 did; and others appear in garments of various colours.

[3] Furthermore it should be realized that all things without exception proceed in successive stages from their first or inmost level to their terminations on the last and lowest and rest on them. Each thing at a prior or more internal stage in order has its own connection with terminations on the lowest level. Therefore if things on the lowest level are dispelled those on interior levels are also scattered. This also explains why there are three heavens. The inmost or third heaven flows into the middle or second heaven; the middle or second heaven flows into the first or lowest heaven, which in turn flows into and resides with mankind. Consequently the human race constitutes the lowest level of order; in it heaven terminates and on it heaven rests. This being so, the Lord in His Divine [Love and Care] always provides for the presence among the human race of a Church in which truth revealed by God exists; such truth on our planet is the Word. By means of this a continuous link exists between the human race and the heavens. This is why every detail of the Word has within it an internal sense which exists for heaven's benefit and whose nature is such that it joins angels' minds to those of people on earth in so firm a bond that they act as one. All this goes to show yet again the nature of a situation in which interior things rest on those at the lowest level.