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.

649. And he cried with a loud cry to him who had the sharp sickle, saying, "Thrust in your sharp sickle and gather the clusters of grapes of the vine of the earth." This symbolizes the Lord's operation from the goodness of His love through the Word's Divine truth into the works of charity and faith among people belonging to the Christian Church.

This is the spiritual meaning of these words, inasmuch as the two angels symbolize the heavens of the Lord's spiritual and celestial kingdoms (nos. 647, 648), and the heavens do nothing of themselves, but from the Lord. For the angels in the heavens are only recipient vessels. Consequently in the spiritual sense nothing else is symbolized but the Lord's operation, here His operation into the church in the Christian world and into the works of charity and faith among the people in it. The vine, indeed, symbolizes that church, as we shall see after this in number 651, and grapes and clusters of grapes symbolize works of charity. This is the symbolism of grapes and clusters of grapes because they are the fruits of the vine in a vineyard, and fruits in the Word symbolize good works.

[2] The angel who came out from the altar told the angel who came out of the temple to thrust in his sickle and gather the grapes because, as we said before, the angel who came out from the altar symbolizes the heavens of the celestial kingdom, or heavens characterized by the goodness of love, while the angel who came out of the temple symbolizes the heavens of the spiritual kingdom, or heavens characterized by truths of wisdom; and the goodness of love does nothing by itself, but only through the truth of wisdom, and the truth of wisdom does nothing by itself, but only in response to the goodness of love. The reality of this is something we showed many times in Angelic Wisdom Regarding Divine Love and Wisdom. That is why the angel who came out from the altar told the angel who came out of the temple to thrust in his sickle and gather the clusters of grapes of the vine of the earth.

That now is why this description symbolizes the Lord's operation from the goodness of His love through the Divine truth of His Word.

[3] That grapes and clusters of grapes symbolize goods and the works of charity can be seen from the following passages:

Woe is me! ...I have become like the gatherings of summer, like the gleanings of vintage grapes; there is no cluster to eat; first-ripe fruit my soul desires. The holy man has perished from the earth, and the upright among men. (Micah 7:1-2)

Their grapes are grapes of gall, they have bitter clusters. (Deuteronomy 32:32)

My beloved had a vineyard... He expected it to produce good grapes, but it produced wild grapes. (Isaiah 5:1-2, 4)

They look to other gods, they love flagons of grapes. (Hosea 3:1)

...every tree is known by its own fruit. ...people do not gather figs from thorns, nor do they gather grapes from a bramble bush. (Luke 6:44)

...in the midst of the land... it shall be... like the gleanings of grapes when the grape harvest is done. (Isaiah 24:12-13)

If the gatherers of the grapes come to you, they will not leave any gleanings. (Jeremiah 49:9, cf. Obadiah verses 4, 5)

The plunderer has fallen on... your grape harvest. (Jeremiah 48:32-33)

You will be troubled, you complacent ones, for the grape harvest is failing, the gathering will not come. (Isaiah 32:9-10)

And so on elsewhere where the fruit of the vineyard and the fruit of the vine are mentioned.

Some goods are the goods of a celestial love, and some are the goods of a spiritual love. The goods of a celestial love are those of love toward the Lord, and the goods of a spiritual love are those of a love for the neighbor. The latter goods are called goods of charity and are those meant by the fruits of the vineyard, which are grapes and clusters of grapes. But the goods of love toward the Lord are meant in the Word by the fruits of trees, primarily olives.

[4] "For her grapes are ripe." This symbolically means, because the Christian Church has reached its last state.

The ripening of the vineyard's grapes has the same symbolic meaning as the drying of the harvest above, but a harvest is mentioned in reference to the church in general, while a vineyard is mentioned in reference to the church in particular. The drying of the harvest symbolizes the last state of the church, as may be seen in no. 645 above, and so likewise does the ripening of the grapes of the vineyard.

A vineyard symbolize the church which has the Word's Divine truth and where the Lord is thereby known, since wine symbolizes the interior truth that comes from the Lord through the Word. The vineyard here accordingly symbolizes the Christian Church.

That wine symbolizes truth springing from the goodness of love, thus from the Lord, may be seen in no. 316 above.