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

AC 2610. In the internal sense of this chapter the Lord‘s Divine Rational is first treated of, which is represented by "Isaac" (verses 1-8).

AC 2611. Next the merely human rational, which was then separated, and which is the "son of Hagar the Egyptian" (verses 9-12).

AC 2612. After this had been separated, the spiritual church is represented by the same, namely, by Hagar’s son, as well as by his mother; which church and its state are treated of in (verses 13 to 21).

AC 2613. Concerning the human rational things that were adjoined to the doctrine of faith, which in itself is Divine (verses 22-34).

AC 2614. This doctrine together with those things adjoined is "Beer-sheba" (verses 14, 31, 33).

2497. The chapter deals with the Lord's state when He first received instruction in matters of doctrine regarding charity and faith. The state itself is meant by Kadesh and Shur; the doctrine of faith by Abimelech the king of Gerar, verses 1-2. To begin with He thought regarding the rational, that it should be consulted, verse 2, but it was not in fact consulted, verses 3-4, 8-9. The reasons why He thought in this way, verses 5-6, 10-12, 13. The doctrine of charity and faith is spiritual deriving from a celestial origin, verse 7. Such was the manner of His instruction, during which all rational concepts, and factual knowledge as well, served Him like a garment or clothing, verses 14-16. And in this way the doctrine was perfect, verse 17, which it would not have been if it had derived from the rational, verse 18.