7644. And it shall cover the surface of the land. That this signifies the ultimates of the natural mind, is evident from the signification of “the surface,” as being things external, thus ultimate; and from the signification of “the land,” here the land of Egypt, as being the natural mind (see n. 5276, 5278, 5280, 5288, 5301).
Arcana Coelestia #1147
1147. And unto them were sons born. That these signify the doctrinals thence derived, is evident from the signification of “sons” in the internal sense, as being the truths of faith, and also the falsities, consequently doctrinal matters; by which both true and false are meant, for such are the doctrinals of churches. (That “sons” have such a signification may be seen above, n. 264, 489, 491, 535)