In the third chapter of the Book of Jonah, Jonah finally reaches Nineveh, and starts preaching repentance and reformation to the people there. And... they listen! Even the King of Assyria listens!

The inner meaning of the story is pretty close to the surface here, and there's important symbolism. Swedenborg summarizes the chapter's meaning in this one sentence:

"The nations, hearing from the Word of God about their sins, and that they would perish, were converted after repenting, and were heard by the Lord, and saved." (The Inner Meaning of the Prophets and Psalms 213)

Rev. George McCurdy, in his exegesis of this chapter, offers this summary:

The great city of Nineveh has many spiritual representations. The world saw Nineveh as a mighty nation, but in the eyes of the Lord, it represented the shallowness and weakness (death) of false doctrines, contrived beliefs confirmed by the proprium (self love), the fallacies of the senses, and the unenlightened understanding that spawns spiritual ignorance.

The Lord’s mercy and love for all prompted Him not only to send His message to Nineveh, but to ensure that it would be preserved for eternity. Jonah’s call to "arise and go" preach to Nineveh is a call for spiritual renewal. It is a call for repentance. The fasting, sackcloth, and ashes symbolize a call to be aware that "where there is no truth, there is no church."

Where the Word is closed, and not loved, there is a loss of conjunction with the Divine resources. The fasting of man and beast symbolizes a need for the spiritual and natural appetites to come to the Lord for that "bread which comes down from heaven." The Ninevites giving up their natural food and drink represents their turning away from "as-of-self" concepts and reminds all who read and hear the Word of the Lord to rely on heavenly manna.

"Why do you spend money for what is not bread, and your wages for what does not satisfy? Listen carefully to Me and eat what is good, and let your soul delight itself in abundance…" (Isaiah 55:2)

The king sitting in ashes and mourning represents a sorrowful attitude toward "the remains of the fire of self-love." Repentance involves self-examination, making oneself guilty for the sins and evils committed, asking the Lord for His help, and desiring to attain a new life.

As we mull over this concept, think about the Lord’s preaching on earth. As He went about His mission, He often used these words: "You have heard it said of old… but I say unto you…" Putting aside human traditions and taking on the Lord’s teachings is an ongoing effort. Jonah was told to preach the words of the Lord. He was not to make things up from his memory. He was to be a true and faithful prophet of the Lord’s ways.

Here's a link to an interesting (audio) sermon on this chapter, by Rev. Todd Beiswenger.

Rev. Martin Pennington suggests two explanatory passages from Swedenborg's theological writings:

"Forty days means a period of temptation combats or severe change." (Arcana Coelestia 730)

"A fast represents those who are in a state of unhappiness when good is no longer joined to the truths." (Arcana Coelestia 9182[10])

Other references of interest listed by Rev. McCurdy include:

"As ‘forty’ signified what is full or complete… forty signifies what is complete in respect to instruction and influx… for this reason it was said by Jonah to the Ninevites that ‘the city would be overthrown after forty days" (Jonah 3:4) (Arcana Coelestia 9437[2])

"By being clothed in sackcloth is signified mourning on account of the vastated truth in the church; for garments signify truths; and therefore, to be clothed in sackcloth, which is not a garment, signifies mourning that there is no truth; and where there is no truth, there is no church." Jonah 3:5-6 is cited. (Apocalypse Revealed 492)

"…the rite of putting sackcloth on the loins to testify…mourning may be seen from the historic and prophetic parts of the Word, as in… Jonah 3:5-8… for a sign representative of mourning over the evil on account of which Nineveh was to perish; thus over destroyed good." (Arcana Coelestia 4779[2])

"From the signification of garments it is also manifest why they rent their garments, when any one spoke against the Divine truth of the Word… and why, on account of transgressions against Divine truths, they put off their garments, and put on sackcloth." Jonah 3:5, 6, and 8 are cited. (Apocalypse Revealed 166)

"That ‘ashes’ denote falsity, may be confirmed from passages where another word for ‘ashes (cinis)’ is used, for these ashes have a like origin…" Jonah 3:6 is cited. (Arcana Coelestia 7520)

"…by ‘ashes’ in the opposite sense, namely, what is condemned that remains after the burning from the fire of self love. This is signified by ‘the ashes’ which they carried on the head, and in which they rolled themselves when bewailing their sins." Jonah 3:6 is cited. (Arcana Coelestia 9723)

"In the spiritual sense by kings those who are in truths are signified, by the great ones those who are in goods, by the rich those that are in the knowledge of good, by the mighty they that are in erudition, by servants they that are in such things from others, and thus from memory, and by freemen they that are in such things from themselves…" Jonah 3:7 is cited. (Apocalypse Revealed 337)

"The interior good and also the interior evil…are signified by ‘man,’ are those which are of the intention or end, for the intention or end is the inmost of man; but the exterior good and also the exterior evil which are signified by ‘beast,’ are those which are of the thought, and of the consequent action when nothing stands in the way…By ‘beast,’…in respect to the external or natural man, a man is nothing else than a beast, for he takes delight in the like cupidities and pleasures, as also in the like appetites and sense…Therefore… from a holy rite it was commanded by the king of Nineveh, that both man and beast were to fast, and were to be covered with sackcloth (Jonah 3:7, 8)." (Arcana Coelestia 7523)

"… in the spiritual world a man’s affections appear at a distance like beasts… and beasts, viewed in themselves, are nothing but forms of natural affections… By man and beasts together is signified man as to spiritual and natural affection, in the following passages… Jonah 3:7, 8…" (Apocalypse Revealed 567)

"Here ‘webs’ and ‘garments’ are predicated of things of the understanding, that is, of the thought; ‘iniquity’ and ‘violence,’ of things of the will, that is, of works. In Jonah 3:8… the ‘evil way’ is predicated of falsities, which are of the understanding; and ‘violence,’ which are of the will." (Arcana Coelestia 623[2])

"…the ‘wrath of anger’ is attributed to Jehovah, and consequently ‘repentance.’" (Arcana Coelestia 588[2])

"…the Word is such in the sense of the letter, it may be evident that it cannot be understood without doctrine. But let examples illustrate this. It is said that Jehovah repenteth (Jonah 3:9; 4:2), and it is also said that Jehovah repenteth not (Num. 23:19…): without doctrine these statements do not agree." (Teachings Regarding the Sacred Scripture 51)

"In these passages (Jonah 3:9,10) Jehovah is said to have ‘repented,’ when yet it cannot be that He repents, because He knows all things before He does them; from which it is evident that by ‘repenting’ is signified mercy." (Arcana Coelestia 10441[2-4])

Finally, here's a link to Rev. McCurdy's study guide for the Book of Jonah, which is available for free as a .pdf, for your use.

172. I explained in Teachings for the New Jerusalem on Sacred Scripture that the Lord is the Word and that all the teaching of the church should be based on the Word. Since the Lord is the Word, then, it follows that when we are being taught by the Word we are being taught by the Lord alone. However, since this is hard to grasp, I need to make it clear in the following sequence. (a) The Lord is the Word because it comes from him and is about him. (b) [The Lord is the Word] also because it is divine truth coming from divine good. (c) Being taught from the Word is therefore being taught from him. (d) It does not reduce the immediacy that this happens indirectly, through sermons.

[2] (a) The Lord is the Word because it comes from him and is about him. No one in the church denies that the Word comes from the Lord, but even though no one denies that the Word is about no one but the Lord, no one really knows this. I have, however, explained it in The Doctrine of the New Jerusalem respecting the Lord 1-7, 37-44; and Teachings for the New Jerusalem on Sacred Scripture 62-69, 80-90, 98-100. Since the Word comes from the Lord alone and is about the Lord alone, it follows that when we are being taught from the Word we are being taught from the Lord. The Word is actually divine. Who is able to communicate something divine and instill it into our hearts except Divinity itself, the source and the subject? This is why when the Lord talks with his disciples about their union with him he talks about their abiding in him and his words abiding in them (John 15:7), about his words being spirit and life (John 6:63), and about making his dwelling with people who keep his words (John 14:20-24). This means that thinking from the Lord is thinking from the Word, to all appearances thinking by means of the Word.

I have explained throughout Teachings for the New Jerusalem on Sacred Scripture, from beginning to end, that everything in the Word is in touch with heaven; and since the Lord is heaven, this means that everything in the Word is in touch with the Lord himself. Heaven's angels do have access to heaven, but this too is from the Lord.

[3] (b) The Lord is the Word also because it is divine truth coming from divine good. The Lord teaches that he is the Word in John by saying, "In the beginning was the Word, and the Word was with God, and God was the Word, and the Word was made flesh and dwelt among us" (John 1:1, 14). Because until now this has been understood only as saying that the Lord teaches us through the Word, it has been taken as hyperbole with the implication that the Lord is not really the Word. This is because people have not realized that "the Word" means what is divine and true coming from what is divine and good, or in other words, divine wisdom from divine love. I explained that these are the Lord himself in part 1 of Divine Love and Wisdom, and explained that they are the Word in Teachings for the New Jerusalem on Sacred Scripture 1-86 [Teachings for the New Jerusalem on Sacred Scripture 1-26].

[4] Now I need to explain briefly how the Lord is what is divine and true from what is divine and good. We are not human because of our faces and bodies but because of the goodness of our love and the truths of our wisdom; and since this is what makes us human, we are also whatever is true and good about us, our own love and our own wisdom. Apart from these, we are not human. The Lord, though, is what is essentially true and essentially good, or love itself and wisdom itself; and these are the Word that was in the beginning with God, that was God, and that was made flesh.

[5] (c) Being taught from the Word is therefore being taught by the Lord himself because it is being taught from what is essentially good and essentially true, or from the love itself and wisdom itself that are the Word, as just stated. Still, we all learn within the limits of the comprehension of our love. Anything beyond that is transient.

People who are taught by the Lord in the Word learn a few truths in this world, but they learn a great many when they become angels. The deeper levels of the Word, the divine spiritual and divine heavenly contents, are being instilled at the same time. However, these are not opened up until after our death, in heaven, where we come into an angelic wisdom that in comparison to our earlier human wisdom is simply indescribable. You may see in Teachings for the New Jerusalem on Sacred Scripture 5-26 that the divine spiritual and divine heavenly contents that constitute the wisdom of angels are present throughout the Word, in its every detail.

[6] (d) It does not reduce the immediacy that this happens indirectly, through sermons. The only way the Word can be taught is indirectly, through our parents, teachers, preachers, and books, and especially by our reading it. Still, these are not our teachers: the Lord is, using them as means. This is derived from what preachers know, too. They say that they are not talking from their own resources but from the spirit of God and that everything true, like everything good, comes from God. They can talk and can convey things to the minds of many, but not to anyone's heart; and anything that does not enter the heart dies in the mind. "The heart" means our love.

We can see from this that we are led and taught by the Lord alone and that this happens directly from him when it happens from the Word. This is a most treasured secret of angelic wisdom.