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.

2089. 'Twelve princes will he beget' means the first and foremost commandments [of faith] inhering in charity. This is clear from the meaning of 'twelve' as all things belonging to faith, and from the meaning of 'princes' as first and foremost features. King and princes are mentioned in various places in the Word, but in the internal sense they nowhere mean king or princes but the first and foremost features of the subject under discussion. That 'kings' means truths taken as a whole has been shown already in 2015, and that 'princes' means the first and foremost aspects of truth, which are commandments, in 1482. For this reason angels, especially spiritual angels, are called principalities, because they are governed by truths. Princes have reference to truths which go with charity because, as stated above in 2088, spiritual people receive charity from the Lord through truths which to them look like truths, and through charity they receive conscience.

[2] Up to now the world has not known that 'twelve' means all things of faith. Yet every time the number twelve occurs in the Word, in historical or in prophetical sections, it has no other meaning. The twelve sons of Jacob, and therefore the twelve tribes named after them, have no other meaning. And the same applies to the Lord's twelve disciples. Each one of Jacob's sons and each of the disciples represented some essential and primary aspect of faith. What each son of Jacob represented, and therefore what each tribe of Israel represented, will in the Lord's Divine mercy be discussed later on at Genesis 29, 30, where the sons of Jacob are the subject.