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.

4766. 'And I, where do I go?' means, Where now is the Church? This is clear from the representation of 'Reuben' as the Church's faith in general, dealt with in 4731, 4734, 4761. And because Reuben says of himself, 'And I, where do I go?' the meaning is, Where now is the Church's faith? or what amounts to the same, Where now is the Church? For the Church does not exist where no heavenly Joseph - that is, no Lord as regards Divine Truth - does so. In particular it has no existence where the Divine Truth that the Lord's Human is Divine and the Truth that charity, and therefore the works of charity, is the essential element of the Church have no existence, as may be seen from what has been shown in this chapter about these two Truths.

[2] If there is no acceptance of this Divine Truth, that the Lord's Human is Divine, then of necessity it follows that a triad and not a single entity should be worshipped, and only half the Lord, that is, His Divine but not His Human (for is there anyone who worships that which is not Divine?) Is the Church anything when a triad is worshipped, each of the three separately from another, or what amounts to the same, when equal homage is paid to each of them? For although the three are called one, thought still keeps them separate and makes them three, the declaration 'a single entity' being no more than a saying spoken with the lips. Let anyone ask himself, when he says that he acknowledges and believes in one God, whether or not he has thoughts of three. Or when he says that the Father is God, the Son is God, and the Holy Spirit is God, and that these are distinct and separate both in their persons and as to their functions, whether he can think that there is one God, except in the way that three who are distinct from one another make one through unanimity and also through deference insofar as one goes forth from another. When therefore three gods are worshipped, where then is the Church?

[3] But if the Lord alone is worshipped, in whom the perfect Triad dwells, and in whom is the Father and the Father in Him, as He Himself says in the following places -

Even though you do not believe Me, believe the works, that you may know and believe that the Father is in Me, and I in the Father. John 10:38.

He who has seen Me has seen the Father. Do you not believe, Philip, that I am in the Father, and the Father in Me? Believe Me that I am in the Father, and the Father in Me. John 14:9-11.

He who sees Me sees Him who sent Me. John 12:45.

All Mine are Yours, and Yours are Mine. John 17:10.

- then it is a Christian Church, as it is when it keeps to the following spoken by the Lord,

The first of all the commandments is, Hear, O Israel, the Lord our God is one Lord; therefore you shall love the Lord your God with all your heart, and with all your soul, and with all your mind, and with all your strength. This is the first commandment. The second is like it, You shall love your neighbour as yourself. There Is no other commandment greater than these. Mark 12:29-31.

'The Lord our God' is the Lord, see Matthew 4:7, 10; 22:43-44; Luke 1:16-17; John 20:28, 'Jehovah' in the Old Testament being called 'the Lord' in the New, see 2921.

[4] If this Divine Truth too goes unaccepted both in doctrine and in life - the Truth that love towards the neighbour, that is, charity, and therefore the works of charity, is the essential element of the Church - then of necessity it follows that thinking what is true exists in the Church but not thinking what is good. That being so, the thought of one who belongs to the Church may consist of elements that contradict and stand opposed to each other; that is to say, thinking what is evil and thinking what is true may be present simultaneously. In thinking what is evil he lives with the devil and in thinking what is true he does so with the Lord. But truth and evil cannot possibly be in accord,

No one can serve two masters, either he will hate the one and love the other . . . Luke 16:13.

When faith separated from charity advocates this, and endorses it in life, then no matter how much it talks about the fruits of faith, where indeed is the Church?