Arcana Coelestia #2637
2637. When Isaac his son was born unto him. That this signifies when the Lord’s rational was made Divine, is evident from the signification of “being born,” which is to come forth [existere] (see n. 2584, 2621, 2629) and from the representation of “Isaac,” as being the Divine rational (see n. 2630). This is said to be “born to Abraham,” when made Divine; as also above, verse 3: “Abraham called the name of his son that was born unto him” (see n. 2628).
Arcana Coelestia #2630
2630. Isaac. That this signifies the Divine Rational, is evident from what has been said before concerning Abraham, Isaac, and Jacob (n. 1893, 2066, 2083), namely, that Abraham represents the supreme Divine, Isaac the Divine rational, and Jacob His Divine natural; as will also be seen hereafter, where Isaac is treated of.