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.

409. Similiter se res habuit cum haeresi quae ‘Cain’ vocata quae temporis tractu vastata est, nam agnovit quidem amorem sed fidem principalem fecit, et praetulit amori; at haereses inde derivatae sensim aberrabant ab hoc, et ‘Lamech’, qui fuit sextus ordine, prorsus etiam fidem negavit: cum hoc tempus fuit, tunc nova lux seu mane illuxit, et facta est Ecclesia nova, quae hic vocatur ‘Adah et Zillah’, quae uxores Lamechi vocantur. Uxores Lamechi, qui nullius fidei fuit, dicuntur, sicut Ecclesia interna et externa Judaeorum, qui quoque nullius fidei fuerant, quae Ecclesiae quoque uxores vocantur in Verbo; quod etiam repraesentatum fuit per ‘Leam et Rachelem’, binas uxores Jacobi, quarum ‘Leah’ repraesentabat Ecclesiam externam et ‘Rachel’ internam; quae Ecclesiae, tametsi binae apparent, usque una sunt, nam externa seu repraesentativa absque interna nihil est nisi quoddam idololatricum aut mortuum, at interna cum externa Ecclesiam et unam eandemque constituit, sicut hic ‘Adah et Zillah’: sed quia Jacobus seu posteritas Jacobi erat sicut Lamech nullius fidei, Ecclesia non potuit manere ibi, sed translata est ad gentes, qui non in infidelitate sed in ignorantia vixerunt. Raro, si usquam, manet Ecclesia apud eos qui veritates habent apud se, dum vastati sunt, sed transfertur ad eos qui prorsus nihil de illis sciunt, nam multo facilius hi amplectuntur fidem quam illi.