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.

30. Verses 14-17 And God said, Let there be lights in the expanse of the heavens, to make a distinction between the day and the night; and they will be for signs, and for set times, and for days and years. And they will be for lights in the expanse of the heavens, to give light upon the earth; and it was so. And God made the two great lights, the greater light to have dominion over the day, and the lesser light to have dominion over the night; and the stars. And God set them in the expanse of the heavens to give light upon the earth.

No one can have an adequate understanding of what 'the great lights' are unless he knows what the underlying essence of faith is and how it develops in people who are being created anew. The very essence and life of faith is the Lord alone. In fact it is impossible for anyone who does not believe in the Lord to have life, as He Himself has said in John,

He who believes in the Son has eternal life; but he who does not believe in the Son will not see life, but the wrath of God will rest upon him. John 3:36.

[2] With people who are being created anew faith develops as follows: First of all they have no life, for life does not exist in anything evil and false but in what is good and true. Then they start to receive life from the Lord by means of faith - first by faith existing in the memory, which is factual faith, then by faith existing in the understanding, which is conceptual faith, and after this by faith existing in the heart, which is loving or saving faith. Factual faith and conceptual faith are represented in verses 3-13 by the inanimate, but faith made alive by means of love is represented in verses 20-25 by the animate. Consequently this is the first point at which love and faith deriving from it, which are called 'lights', are dealt with. Love is 'the greater light which has dominion over the day', and faith deriving from love is 'the lesser light which has dominion over the night'. And because they ought to make one the verb in the phrase 'let there be lights 'is singular and not plural.

[3] Love and faith have their place in the internal man as warmth and light do in the external, bodily man, and for this reason love and faith are represented by warmth and light. Therefore it is said that 'the lights' were set in the expanse of the heavens, that is, in the internal man - the greater light in his will and the lesser in his understanding. Yet they make their appearances in the will and understanding only as sunlight does in the objects it strikes. To the Lord alone belongs the mercy which moves the will with love and the understanding with truth or faith.