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.

6175. 'And the days of Jacob, the years of his life, were a hundred and forty-seven years means the state in general and its essential nature. This becomes clear if the meaning of the numbers seven, forty, and a hundred is brought out. ¹ For what seven means, see 395, 433, 716, 728, 881, 5165, 5268; for what forty means, 730, 862, 2272, 2273; and for what a hundred means, 1988, 1636, 4400. But no easy explanation of the sum of these numbers is possible, for they contain far more than anyone can calculate or explain intelligibly. In general these numbers contain the entire state of the reality represented by 'Jacob' and its essential nature. The angels can see these things in their entirety simply from that number; they can do so because with the angels all numbers in the Word pass into ideas about spiritual realities. This has also been made evident to me by the fact that on several occasions a long sequence of numbers has appeared in front of me, and whenever they have appeared the angels have told me that the numbers held, in sequence, the realities which they were talking about to one another. This in addition explains why the most ancient people who belonged to the celestial Church also had a way of calculating that consisted of numbers employed to express heavenly things which could barely be understood by the use of ideas in the natural mind. But after those people's times such evaluations perished, along with the perception of heavenly things. All that remained was a knowledge of the general meaning of the simple numbers, such as three, six, seven, and twelve, but not much knowledge of the meaning of compound numbers. At the present day however even the idea that numbers in the Word mean something more than their numerical values is quite unknown, and therefore the idea will probably be treated as one of those that are unbelievable.

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