Arcana Coelestia #2922
2922. 'In the choicest of our graves' means well-pleasing in regard to regeneration. This is clear from the meaning of 'choosing', 'a choice', and 'choicest' as that which is preferred or well-pleasing, and from the meaning of 'a grave' as resurrection and regeneration, dealt with above in 2916.
Isaiah 9:7-8
7
Of the increase of his government and of peace there shall be no end, on the throne of David, and on his kingdom, to establish it, and to uphold it with justice and with righteousness from that time on, even forever. The zeal of Yahweh of Armies will perform this.