Arcana Coelestia #3243
3243. All these were the sons of Keturah. That this signifies as regards the doctrinal things and worships thence derived, is evident from the signification of “sons,” as being truths and doctrinal things (n. 489, 491, 533, 1147, 2623); and from the representation of Keturah, as being Divine truth spiritual conjoined with Divine good spiritual (n. 3236, 3237); thus those things which are of the Lord’s spiritual kingdom; and because the worship of this kingdom is according to doctrinal things, it follows that the “sons of Keturah” denote these things, and also the derivative worships.
Arcana Coelestia #3237
3237. And her name was Keturah. That this signifies the essence of this Divine truth, is evident from the signification of “name,” as being quality; and of “calling by name,” as being to know of what quality one is (see n. 144, 145, 1754, 1896, 2009). But seeing that not quality, but being is predicated of the Divine, by “name” here is signified essence, and indeed the essence of the Divine truth which is signified here by “her,” namely the woman. (That here the “woman” is Divine truth, may be seen i mmediately above, n. 3236.) From this it is evident what Keturah in general involves.