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.

665. That establishing a covenant' means that he would be regenerated becomes quite clear from the fact that the only kind of covenant that can exist between the Lord and man is conjunction by virtue of love and faith. And so a covenant means conjunction; indeed it is the heavenly marriage that is the supreme covenant of all. The heavenly marriage or conjunction does not show itself however except with people who are being regenerated. Regeneration itself therefore in the broadest sense is meant by a covenant. The Lord enters into a covenant with man when He regenerates him, and consequently among men of old a covenant had no other representation. From the sense of the letter no other impression is gained than that the covenant made with Abraham, Isaac, and Jacob, and so often with their descendants, concerned just those personages. But those people were by nature such as to be incapable of being regenerated, for they focused worship exclusively on things that were external, and imagined external things to be sacred without things that are internal allied to them. Consequently the covenants made with them were no more than representations of regeneration, as were all their religious ceremonies, and as were Abraham, Isaac, and Jacob themselves who represented the things of love and faith. In a similar way priests or high priests, whatever their character, including infamous ones, could represent the heavenly and most holy priesthood. In representations no attention is paid to the person who represents but to that which is represented by him. Thus all the kings of Israel and Judah, including the worst of them, represented the Lord's kingship, and so indeed did the Pharaoh who promoted Joseph over the land of Egypt. These and many other considerations which in the Lord's Divine mercy will be dealt with later on show that the covenants made so often with the sons of Jacob were nothing more than religious ceremonies which were representative.