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.

5199. 'Beautiful in appearance' means which are expressions of faith. This is clear from the meaning of 'beauty' and 'appearance'. Spiritual 'beauty' is essentially an affection for interior truth, while spiritual 'appearance' is essentially faith, so that 'beautiful in appearance' means an affection for the truth of faith, see 553, 3080, 3821, 4985. The reason spiritual beauty is an affection for interior truth is that truth is the outward form taken by good. The good which they receive in heaven from the Divine provides angels with the life they possess; but the outward form taken by that life is provided by the truths springing from that good. The truth of faith however does not provide the beauty but the affection itself present within the truths of faith springing from good. Beauty that is provided solely by the truth of faith is like the beauty of a face seen in a painting or a sculpture, but the beauty provided by an affection for truth springing from good is like the beauty of a real face full of life imparted to it by heavenly love; for as is the love - that is, as is the affection - which shines out of the form provided by the face, so is the beauty seen there. This being so, the outward appearance of the angels is indescribably beautiful. Their faces are radiant with the good of love passing through the truth of faith, which good and truth not only present themselves visually but can also be felt from the spheres that emanate from them.

[2] The reason why this is the source of beauty is that heaven in its entirety is the Grand Man and has a correspondence with every single part of the human being. Everyone therefore who has the good of love and for that reason the truth of faith present in him has the form which heaven possesses present within him; and as a consequence of this there is also imparted to him the beauty which heaven possesses, heaven being a place where the Divine going forth from the Lord is the All in all. This also explains why those in hell, being the opposite of what is good and true, are horribly ugly, and in the light of heaven do not look like human beings but like monsters. The reason why spiritual appearance (aspectus) is faith is that in the internal sense 'looking at (aspicere) and seeing' means understanding, and in a sense more internal than this having faith is meant, see 897, 2150, 2315, 2807, 3863, 3869, 4403-4421.