Apocalypse Explained#432
432. Verse 5. Of the tribe of Judah twelve thousand sealed; of the tribe of Reuben twelve thousand sealed; of the tribe of Gad twelve thousand sealed.
5. "Of the tribe of Judah twelve thousand sealed," signifies love to the Lord, and that all who are in that love are in heaven, and come into heaven n. 433; "of the tribe of Reuben twelve thousand sealed," signifies the light of truth from that good, and that all who are in that light are in heaven and come into heaven n. 434; "of the tribe of Gad twelve thousand sealed," signifies the consequent good of life (n. 435, 436).
Arcana Coelestia#8609
8609. 'And they took a stone' means the lowest level of God's truth. This is clear from the meaning of 'a stone' as truth, 643, 1298, 3720, 3769, 3771, 3789, 3798, 6426, in this instance the lowest level of truth since it was put underneath him and he sat on it. An ordinary stone furthermore means a lower level of truth, while a precious stone means a higher or more internal level of truth. What the lowest level of truth is becomes clear from what has been stated above in 8603 about the levels of truth that follow one another in order; that is to say, there are interior truths and exterior truths, the lowest of which are meant by the lowest level of truth.