Here are some excerpts from Swedenborg's "Arcana Coelestia" that help explain the inner meaning of this chapter:

AC 1985. The subject here treated of is the union of the Lord’s Divine Essence with the Human Essence, and of the Human Essence with the Divine Essence; and also the conjunction of the Lord, through the Human Essence, with the human race.

AC 1986. Jehovah was manifested to the Lord in His Human (verse 1). Foretelling the union (verses 2, 3); namely, of the Divine with the Human, and of the Human with the Divine (verses 4, 5). And that all good and truth is from Him (verse 6). The conjunction of the Divine with the human race would thus be effected through Him (verse 7). And the heavenly kingdom would be His, which He would give to those who should have faith in Him (verses 8, 9). But man must first remove his loves and their foul cupidities, and so be purified; this is what was represented and is signified by circumcision (verses 10, 11). Thus conjunction would be effected, both with those who are within the church, and with those who are without it (verse 12).

[2] Purification must by all means precede; otherwise there is no conjunction, but condemnation; and yet after all the conjunction cannot take place except in man‘s impurity (verses 13, 14). The union of the Human Essence with the Divine Essence, or of truth with good, is foretold (verses 15 to 17). Also conjunction with those who are in the truths of faith, namely, as with those who are of the celestial church, so with those who are of the spiritual church (verses 18, 19). And that the latter also would be imbued with the goods of faith (verse 20). In conclusion, these things will be effected through the union in the Lord of the Human Essence with the Divine Essence (verse 21). The end of the prediction (verse 22). It was so to be done, and it was so done (verses 23 to 27).

2137. The Lord's state of perception within the Human at that time is meant by the oak-groves of Mamre, verse 1.

In this state He perceived the Divine, which was manifesting itself to His Human, verse 2

- at which He rejoiced, verse 3;

also, in this state, He desired that the Divine should draw nearer to His Human by taking on something natural, verse 4,

and that the Human should draw nearer to the Divine by taking on the celestial, verse 5

- the celestial, and the spiritual deriving from this, which He took upon Himself being meant by the three measures of the meal of fine flour from which the cakes were made, verse 6;

and then, in this state, He put on a conformable natural, which is meant by the young bull, verse 7;

as a result conformability existed and a communication of the Divine with the Human, and of the Human with the Divine, verse 8.