The "midst" of something in the Bible represents the thing that is most central and most important to the spiritual state being described, the motivation that drives everything else. In general this will be something we love or feel, because at the core of things we are what we love; our loves define us.

(références: Apocalypse Revealed 44, 90, 268; Arcana Coelestia 2252, 2940, 10153, 10365, 10557, 10635, 10641)

42. Verse 21 And God created the great sea monsters, and every living creature that creeps, which the waters produced abundantly according to their kinds; and all winged birds according to their kinds; and God saw that it was good.

As has been stated, 'fish' means facts, here facts quickened and brought to life through faith from the Lord. 'Sea monsters' means those facts' general sources, below which and from which details derive. Nothing whatever exists in the universe that does not depend on some general source for its commencement and continuance. In the Prophets sea monsters or whales are mentioned several times, and in those places they mean those general sources of facts. Pharaoh, the king of Egypt, who represents human wisdom or intelligence - that is, knowledge in general - is called 'a great sea monster', as in Ezekiel,

Behold, I am against you, Pharaoh king of Egypt, the great monster lying in the midst of his ¹ rivers, who has said, It is my river and I have made myself. Ezekiel 29:3.

[2] And elsewhere in Ezekiel,

Raise a lamentation over Pharaoh, king of Egypt, and say to him, You are like a monster in the seas, and you have come forth in your rivers, and have troubled the waters with your feet. Ezekiel 32:2

These words mean people who wish to penetrate the mysteries that are part of faith by means of facts, and so from themselves. In Isaiah,

On that day Jehovah will make a visitation with His hard and great and strong sword upon Leviathan the full-length serpent, ² and upon Leviathan the twisting serpent, and He will slay the monsters that are in the sea. Isaiah 27:1.

'Slaying the monsters in the sea' means preventing people's knowing facts even in their general aspects. In Jeremiah,

Nebuchadnezzar king of Babel has devoured me, he has troubled me, he has made me an empty vessel, he has swallowed me up like a sea monster, he has filled his belly with my delicacies, he has cast me out. Jeremiah 51:34.

This stands for the fact that mankind did swallow cognitions of faith, which are 'the delicacies' here, just as the sea monster swallowed up Jonah. In that story the sea monster stands for people who treat general cognitions of faith as mere facts, and behave accordingly.

Notes de bas de page:

90. "'Which is in the midst of the Paradise of God.'" This symbolically means, inwardly in the truths of wisdom and faith.

In the midst means, symbolically, the inmost (nos. 44, 383), here within or inwardly. The Paradise of God symbolizes truths of wisdom and faith. Consequently the tree of life which is in the midst of the Paradise of God symbolizes the Lord accompanied by the goodness of love and charity inwardly in the truths of wisdom and faith. Good also exists inwardly within truths, for good is the essence of life, and truth is the consequent expression of life, as we showed many times in Angelic Wisdom Regarding Divine Love and Wisdom.

That the Paradise of God is the truth of wisdom and faith is apparent from the symbolic meaning of a garden in the Word. A garden there symbolizes wisdom and intelligence, because trees symbolize the people of the church, and their fruits goods of life. That is what the Garden of Eden symbolizes, for it describes the wisdom of Adam.

[2] The garden of God in Ezekiel has the same meaning:

With your wisdom and your understanding you have gained riches for yourself... You were in Eden, the garden of God; every precious stone was your covering... (Ezekiel 28:4, 13)

The subject is Tyre, which symbolizes the church in respect to its concepts of truth and good, thus in respect to its intelligence. Accordingly it is said, "With your wisdom and your understanding you have gained riches for yourself." The precious stones which served as its covering symbolize truths of intelligence.

[3] In the same book:

Assyria was a cedar in Lebanon... The cedars in the garden of God did not hide it... No tree in the garden of God was like it in beauty... All the trees of Eden envied it... in the garden of God. (Ezekiel 31:3, 8-9)

This is said of Egypt and Assyria, because Egypt symbolizes knowledge, and Assyria rationality, which leads to intelligence. A cedar has a similar symbolism.

But because Egypt's rationality led also to a conceit in its own intelligence, therefore it is said of it,

To which of the trees in Eden were you then likened in glory and greatness, when you were brought down with the trees of Eden to the earth below, and you lay in the midst of the uncircumcised...? (Ezekiel 31:18)

The uncircumcised are people who lack the goodness of charity.

[4] In Isaiah:

...Jehovah will comfort Zion..., and make her wilderness like Eden, and her desert like the garden of Jehovah. (Isaiah 51:3)

Zion there is the church. The wilderness and desert are a deficiency of truth and ignorance of it. Eden and the garden of God are wisdom and intelligence.

Wisdom and intelligence are also symbolically meant by a garden in Isaiah 58:11; 61:11, Jeremiah 31:12, Amos 9:14, and Numbers 24:6.

[5] A person of the church is also like a garden in respect to his intelligence when he possesses goodness of love from the Lord, because the spiritual warmth that enlivens him is love, and spiritual light is the resulting intelligence.

People know that these two, warmth and light, cause gardens in the world to bloom. It is the same in heaven. Paradisal gardens are seen in heaven, with trees bearing fruit in accordance with the inhabitants' wisdom that springs from their goodness of love from the Lord. But around people who possess intelligence without the goodness of love, no gardens are seen, but grass, while around those whose faith is divorced from charity, not even grass is seen, but sand.