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.

3519. 'And take for me from there two good kids of the she-goats' means truths born from that good. This is clear from the meaning of 'kids of the she-goats' as truths born from good, dealt with below. The reason for having 'two' was that as in the rational so in the natural there are things of the will and those of the understanding. Things in the natural that belong to the will are delights, while those that belong to the understanding are facts. These two have to be joined together if they are to be anything at all.

[2] As regards 'kids of the she-goats' meaning truths born from good, this becomes clear from those places in the Word where kids and she-goats are mentioned. It should be recognized that all gentle and useful beasts mentioned in the Word mean in the genuine sense celestial things, which are forms of good, and spiritual things, which are forms of truth, see 45, 46, 142, 143, 246, 714, 715, 776, 2179, 2180, 2781, 3218. And since there are various genera of celestial things or forms of good, and consequently there are various genera of spiritual things or forms of truth, one beast has a different meaning from another; that is to say, a lamb has one meaning, a kid another, and a sheep, she-goat, ram, he-goat, young bull, or ox another, while a horse or a camel has yet another meaning. Birds have a different meaning again, as also do beasts of the sea, such as sea monsters, and fish. The genera of celestial and spiritual things, and consequently of forms of good and truth, are more than anyone can number, even though when that which is celestial or good is mentioned, and also when that which is spiritual or truth, this is not envisaged as being anything complex, consisting of many parts, but as a single entity. Yet how complex both of these are, that is, how countless the genera are of which they consist, may be seen from what has been stated about heaven in 3241, to the effect that it is distinguished into countless separate communities, according to the genera of celestial and spiritual things, that is, of goods of love and of derivative truths of faith. Furthermore each genus of good and each genus of truth has countless species into which the communities of each genus are separated. And each species in a similar way has separate sub-species.

[3] The commonest genera of good and truth are what the living creatures offered as burnt offerings and sacrifices represented. And because the genera are quite distinct and separate, people were explicitly commanded to use those living creatures and no others, that is to say, in some sacrifices lambs and ewe-lambs, and also kids and female kids of she-goats were to be used, in other sacrifices rams and sheep, and also he-goats, were to be used, while in other sacrifices again, calves, young bulls, and oxen, or else pigeons and doves, were to be used, see 992, 1823, 2180, 2805, 2807, 2830, 3218. What kids and she-goats meant however becomes clear both from the sacrifices in which they used to be offered and from other places in the Word. These show that lambs and ewe-lambs meant innocence belonging to the internal or rational man, and kids and she-goats innocence belonging to the external or natural man, and so the truth and the good of the latter.

[4] The fact that truth and good present in the innocence that belongs to the external or natural man is meant by a kid and a she-goat is clear from the following places in the Word: In Isaiah,

The wolf will dwell with the lamb, and the leopard will lie down with the kid, the calf also and the young lion and the sheep together; and a little child will lead them. Isaiah 11:6.

This refers to the Lord's kingdom and to the state there in which people have no fear of evil, that is, no dread of hell, because they are with the Lord. 'The lamb' and 'the kid' stand for people who have innocence within them, and who, being the most secure of all, are mentioned first.

[5] When all the firstborn of Egypt were smitten the people were commanded to kill from among the lambs or among the kids a male without blemish, and to put some of the blood on the doorposts and on the lintel of their houses; and so the destroyer would not strike them with the plague, Exodus 12:5, 7, 13. 'The firstborn of Egypt' means the good of love and charity that was wiped out, 3325. 'The lambs' and 'the kids' are states of innocence, in which those with whom these exist are secure from evil. Indeed all in heaven are kept secure by the Lord through states of innocence. That security was represented by the killing of the lamb or kid, and putting the blood on the doorposts and on the lintel of the houses. .

[6] To avert his own death when a person saw Jehovah manifested as an angel he would sacrifice 'a kid of the she-goats', as Gideon did when he saw Him, Judges 6:19, and also Manoah, Judges 13:15-16, 19. The reason they offered a kid was that Jehovah or the Lord cannot appear to anybody, not even to an angel, unless the one to whom He appears is in a state of innocence. Therefore as soon as the Lord is present people are brought into a state of innocence, for the Lord enters in by way of innocence, even with angels in heaven. Consequently no one is able to enter heaven unless he has a measure of innocence, according to the Lord's words recorded in Matthew 18:3; Mark 10:15; Luke 18:17. Regarding people's belief that they would die when Jehovah appeared to them if they did not offer such a burnt offering, see Judges 13:22-23.

[7] Since genuine conjugial love is innocence itself, 2736, it was customary in the representative Church for a man to go to his wife with the gift of a kid of the she-goats, as one reads of Samson in Judges 15:1, and also of Judah when he visited Tamar, Genesis 38:17, 20, 23. The fact that 'a kid' and 'a she-goat' meant innocence is also evident from the sacrifices made as guilt offerings that a person would offer if he had sinned through error, Leviticus 1:10; 4:28; 5:6. Sinning through error is sinning through ignorance that has innocence within it. The same is evident from the following Divine command in Moses,

You shall bring the first of the firstfruits of your land to the house of Jehovah your God. You shall not boil a kid in its mother's milk. Exodus 23:19; 34:26.

Here the requirement 'to bring the firstfruits of the land to the house of Jehovah' means the state of innocence which exists in early childhood; and 'not boiling a kid in its mother's milk' means that they were not to destroy the innocence of early childhood. This being their meaning, the one command, in both places referred to, follows directly after the other. In the literal sense there seems to be no connection at all between them as there is in the internal sense.

[8] Because kids and she-goats, as has been stated, meant innocence it was also required that the curtains over the tabernacle should be made from she-goat hair, Exodus 25:4; 26:7; 35:5-6, 23, 26; 36:14, as a sign that all the holy things represented in it depended for their very being on innocence. 'She-goat hair' means the last or outermost degree of innocence present in ignorance, such as exists with gentiles who in the internal sense are meant by the curtains of the tabernacle. These considerations now show what truths born of good are, and what the nature of these is, meant by the two good kids of the she-goats which Rebekah his mother spoke about to Jacob. That is to say, they are truths belonging to innocence or early childhood, meant also by the things which Esau was to bring to Isaac his father, dealt with in 3501, 3508. They were not in fact such truths, but initially they appeared to be. Thus it was that Jacob pretended by means of them to be Esau.