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.

6238. 'As Reuben and Simeon will they be mine' means that they will be truth and the good of truth. This is clear from the representation of 'Reuben' as faith in the understanding, and the truth of doctrine by means of which one is able to arrive at the good of life, dealt with in 3861, 3866, thus in general truth that belongs to the understanding; and from the representation of 'Simeon' as faith in the will, consequently truth realized in action, which is the good of faith or the good of truth, dealt with in 3869-3872, 4497, 4502, 4503, 5626, 5630, thus in general good which belongs to the new will. The things that Ephraim and Manasseh represent are clearly similar to all this.

[2] But since Reuben profaned what he represented, 4601, and Simeon polluted what he represented, 4497, 4501, 4507, on account of which they were cursed, see verses 3-7 of the next chapter, they lost their birthright and Joseph's sons Ephraim and Manasseh were acknowledged as the firstborn in place of them, 1 Chronicles 5:1. Nevertheless what Reuben and Simeon represented remained with them, for it makes no difference what the character of the person who serves to represent something is like, 665, l097 (end), 4281. That is to say, the representation of faith in the understanding remained with Reuben, and the representation of faith in the will with Simeon. But what resided with Ephraim was the representation of the Church's understanding, and what resided with Manasseh was the representation of the Church's will.