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.

3194. 'Isaac had come from Beer Lahai Roi' means Divine Rational Good born from Divine Truth itself. This is clear from the representation of 'Isaac' as the Lord's Divine Rational, dealt with in 2083, 2630, here as regards Divine Good there since Divine truth, represented by Rebekah, had not yet been summoned out of the natural and joined to it - that joining together being the subject in what follows now; and from the meaning of 'coming from Beer Lahai Roi' as born from Divine Truth. In the original language Beer Lahai Roi means The spring of the Living One who sees me, as above in Genesis 16:13-14, where one reads,

Hagar called the name of Jehovah who spoke to her, You are a God who sees me; for she said, Have I not also here seen after Him who sees me? Therefore she called the spring, Beer Lahai Roi (The spring of the Living One who sees me).

For the meaning of these two verses, see 1952-1958, where also it is evident that 'a spring' means Divine Truth, and that 'the Living One who sees me' means Divine Rational Good, which is there called the Lord's Interior man, springing from Divine Truth. The substance of this very deep arcanum is that Good and Truth belong essentially to the Divine itself; but the Lord's Divine Human came into existence from Divine Good, and was born from Divine Truth. Or what amounts to the same, the Lord's Essential Being (Esse) was Divine Good, and the Manifestation (Existere) of Him was Divine Truth. This was the origin of the Lord's Divine Rational Good to which He joined Divine Truth from the Human.