In Jeremiah 4:31, this signifies sorrow from falsities that extinguish spiritual life. (Apocalypse Explained 315[17])
Arcana Coelestia # 2850
2850. 'And like the sand which is on the seashore' means a whole multitude of correspondent facts. This is clear from the meaning of 'the sea' as facts in general or a gathering together of them, dealt with in 28, 2120, and from the meaning of 'the sand' as facts individually and separately. Facts are compared to 'the sand' because in the internal sense the particles of stone from which the sand is formed mean facts, 643, 1298. Both comparisons are made here - that they will be multiplied 'as the stars of the heavens' and 'as the sand on the seashore 'because 'stars', or cognitions, are related to the rational, whereas 'the sand of the seashore', or facts, are related to the natural. When the things that belong to the rational man, namely the goods and truths present in cognitions, so exist in accordance with the things that belong to the natural man, that is to say, with facts, that they make one or mutually support each other, they in that case correspond. The Lord brings man's rational concepts and his natural images into this state of correspondence when He regenerates him, that is, makes him spiritual. It is for this reason that both the stars of the heavens and the sand on the seashore are mentioned here. Otherwise one phrase would have been sufficient.
Ezekiel 46:1-9
1
Thus says the Lord Yahweh: The gate of the inner court that looks toward the east shall be shut the six working days; but on the Sabbath day it shall be opened, and on the day of the new moon it shall be opened.
2
The prince shall enter by the way of the porch of the gate outside, and shall stand by the post of the gate; and the priests shall prepare his burnt offering and his peace offerings, and he shall worship at the threshold of the gate: then he shall go forth; but the gate shall not be shut until the evening.
3
The people of the land shall worship at the door of that gate before Yahweh on the Sabbaths and on the new moons.
4
The burnt offering that the prince shall offer to Yahweh shall be on the Sabbath day six lambs without blemish and a ram without blemish;
5
and the meal offering shall be an ephah for the ram, and the meal offering for the lambs as he is able to give, and a hin of oil to an ephah.
6
On the day of the new moon it shall be a young bull without blemish, and six lambs, and a ram; they shall be without blemish:
7
and he shall prepare a meal offering, an ephah for the bull, and an ephah for the ram, and for the lambs according as he is able, and a hin of oil to an ephah.
8
When the prince shall enter, he shall go in by the way of the porch of the gate, and he shall go forth by its way.
9
But when the people of the land shall come before Yahweh in the appointed feasts, he who enters by the way of the north gate to worship shall go forth by the way of the south gate; and he who enters by the way of the south gate shall go forth by the way of the north gate: he shall not return by the way of the gate by which he came in, but shall go forth straight before him.
