Arcana Coelestia # 9602
9602. '[This is what] one curtain [shall be]' means so shall it be for the individual truths. This is clear from the meaning of 'curtain' as truth, dealt with above in 9595, so that 'one curtain' or each by itself means the individual truths.
Jeremiah 31:37-39
37
Thus says Yahweh: If heaven above can be measured, and the foundations of the earth searched out beneath, then will I also cast off all the seed of Israel for all that they have done, says Yahweh.
38
Behold, the days come, says Yahweh, that the city shall be built to Yahweh from the tower of Hananel to the gate of the corner.
39
The measuring line shall go out further straight onward to the hill Gareb, and shall turn about to Goah.