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.

8981. 'If his master has given him a woman' means good attached by the spiritual to truth during conflict. This is clear from the meaning of 'master' here as the spiritual, for 'master' in this instance is used to refer to one who is a member of the children of Israel, and by 'the children of Israel' those who are true members of the spiritual Church are meant, that is, who do good from love and affection, or what amounts to the same thing, from charity (regarding 'the children of Israel', that they are members of the spiritual Church, see 6426, 6862, 6868, 7035, 7062, 7198, 7201, 7215, 7223, 7957, 8234, 8805, which being so, they mean in the abstract sense spiritual truths and forms of good, 5414, 5801, 5803, 5806, 5812, 5817, 5819, 5826, 5833, 5879), so that 'master' here means the spiritual; and from the meaning of 'giving him a woman' as attaching good to truth, for 'giving', when said in regard to a woman, means attaching. And 'the slave' is someone who is imbued with the truth of religious teachings and not with complementary good, 8974, while 'the woman' is delight, 8980, but at this point good, because this is given or attached to that truth by the spiritual. Everything is called good that comes from the spiritual, since the spiritual itself is the good of charity. For the meaning of 'woman' as good, see 915, 2517, 4823, 6014, 8337. During conflict is meant because it says that if his master had given him a woman she was to be the master's after the servitude. From this it is evident that the woman was the slave's during servitude but not after it thus during conflict but not after conflict; for servitude lasting six years means labour and conflict, 8975.

[2] Is there anyone who cannot see that this regulation holds an arcanum which no one can know unless it is disclosed to him? For in its outward form it appears contrary to God's justice, that when a slave goes out of servitude the woman who has been given to him should remain the master's, when yet a woman should be her husband's forever. There are many other apparent injustices like these which Jehovah commanded the children of Israel, such as that they were to ask from the Egyptians vessels of gold and silver, and clothes, and in so doing were to plunder them, besides other similar actions, dealt with in their individual places. But although those regulations in their outward form appear, as has been stated, contrary to God's justice, they are not really so; for they rise out of the laws of Divine order in heaven, and these are perfect laws of justice. But those laws cannot be seen unless the internal sense is used to disengage them from the sense of the letter. The law that this regulation rises out of is this: Spiritual good cannot be joined to those who are confined since early childhood to the external things of the Church; it can only be linked to them for as long as they undergo conflict, after which it departs.

[3] To bring this whole matter out into the open, for it is an arcanum, it must be discussed briefly. There are people who - although they have from early childhood thought little about eternal life, and so about the welfare of their soul, and have thought instead about worldly life and its prosperity - have nevertheless led a morally good life and have also believed the truths taught by their Church. When they reach maturer age there is no other way in which they can be reformed than by the linking of spiritual good during conflict. They do not however retain that good but merely use it to strengthen the truths they have been taught. The reason for this is that in their life before then such people have surrendered themselves to worldly kinds of love, and when these have become deeply rooted they do not allow spiritual good to be joined to truth; for those kinds of love are totally repugnant to this good. Nevertheless spiritual good can take hold in those people's thinking when those kinds of love subside, as happens during anxiety, misfortunes, or sicknesses, and the like. At this time an affection to do good from charity enters in; but that affection merely serves to strengthen and root more deeply the truths they have been taught. It cannot however be joined to truth. The reason why is that this charitable affection entering in fills only the understanding part of the mind. It does not pass into the will part of it, and what does not pass into the will is not adopted by or accordingly joined to truth. For goodness and truth with a person come to be joined together when truth passes into the will, consequently when the person wills it and because he wills it does it. Then, for the first time, truth becomes good, or what amounts to the same thing, faith becomes charity.

[4] This cannot come about with those who have from early childhood surrendered themselves to worldly kinds of love and yet have been imbued with truth taught by their Church. For the will part of their mind is occupied by such love, which is the complete opposite of spiritual good and repels it. They allow it into solely the understanding part of their mind, that is, into their thought, when those kinds of love have become dormant, which happens, as stated above, during a state of sickness or misfortune, or during anxiety, consequently during labour and some conflict. This is the arcanum that lies concealed within this regulation; and since the regulation was for that reason representative of the law of Divine order regarding those imbued with the truth of religious teachings and not with the complementary good, in the representative Church it was in keeping with God's justice, even in its outward form.