37. As for the statement that 'the lights will be for signs, and for set times, and for days, and for years', this contains more arcana than can be presented at this point, though no arcanum at all is visible in the sense of the letter. For now only this can be said: Change in spiritual and celestial things takes place both on general and on particular scales, and is comparable to changes that take place through the day and through the year. Changes through the day are from morning to midday, from then on to evening, and through the night to the morning. Changes in the year similar, from spring to summer, from then on to autumn, and through winter to spring. These bring changes in temperature and amount of daylight, and so in the fertility of the earth. Compared to such changes are the changes that take place in spiritual and celestial things. Life without changes and variations would lead to sameness, and so no life at all. Good and truth would not be recognized and identified, let alone perceived. In the Prophets such changes are called 'ordinances', as in Jeremiah,

[Thus] said Jehovah who gives the sun for light by day and the ordinances of the moon and of the stars for light by night, These ordinances will not depart from before Me. Jeremiah 31:35-36.

And in the same prophet,

Thus said Jehovah, If I have not established My covenant of day and night, the ordinances of heaven and earth . . . Jeremiah 33:25.

But these things will in the Lord's Divine mercy be dealt with at Genesis 8:12.

9789. 'For their generations among the children of Israel' means eternity for the spiritual kingdom. This is clear from the meaning of 'generations' as eternity, dealt with below; and from the meaning of 'the children of Israel' as the spiritual Church, dealt with in 9340, thus also the spiritual kingdom. For the Lord's spiritual kingdom in heaven is the spiritual heaven; on earth it is the spiritual Church. The reason why 'generations' means eternity is that in the internal sense generations of faith and charity are meant, 613, 2020, 2584, 6239, 9042, 9079, and so things of heaven and the Church, which things are eternal. Also the children of Israel, to whom the word 'generations' applies, mean the Church, 9340. The fact that eternity is meant by 'generations' is evident from the following places in the Word: In Isaiah,

My righteousness will exist to eternity, and My salvation from generation to generation. ¹ Awake as in the days of old, the generations of eternity. ² Isaiah 51:8-9.

In the same prophet,

I will make you an eternal magnificence, ³ a joy of generation after generation. Isaiah 60:15.

In the same prophet,

Its smoke will go up to eternity. From generation to generation it will be laid waste; no one will pass through it for ever and ever. ⁴ Isaiah 34:10.

In David,

The counsel of Jehovah will stand to eternity, the thoughts of His heart to all generations. ⁵ Psalms 33:11.

In the same author,

I will praise Your name to eternity and forever. ⁶ Generation to generation will praise Your works. Psalms 145:2-4.

In the same author,

They will fear You with the sun, and before the moon, from generation to generation. ⁷ Psalms 72:5.

In Moses,

This is My name to eternity, and this is My memorial from one generation to another. ⁸ Exodus 3:15.

There are very many other places besides these. When it says that things will exist 'to eternity' and from 'generation to generation', 'eternity' has regard to the Divine Celestial or Good, and 'generation' to the Divine Spiritual or Truth. For in the Word, especially the prophetic part, two expressions that have reference to one and the same thing are very frequently used, as in the places quoted above in which eternity and generation to generation occur. They are used because of the heavenly marriage that is present in every single part of the Word. The heavenly marriage is a marriage of good and truth, or the Lord and heaven joined together, see the places referred to in 9263.

Footnotes: