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.

4850. 'The days were multiplied' means a change of state. This is clear from the meaning of 'the days being multiplied' as undergoing a change of state, for 'day' or a time in the internal sense means state, 23, 487, 488, 893a, 2788, 3462, 3785, and 'being multiplied' when used in reference to days or times means undergoing a change. The fact that a change of state is the meaning is also evident from the details that follow. The expression 'to be multiplied' is used because it implies a change of state so far as truths are concerned; for 'to be multiplied' is used in reference to truths, 43, 55, 913, 983, 2846, 2847. Since the terms state and change of state are being used time and again, and yet few know what a state or a change of state is, a statement needs to be made about what these are. Neither time and the passage of time nor space and the extension of space can be associated with the interior aspects of the human being - that is to say, with his affections and his thoughts formed by these - because his affections and thoughts are not located in time and place, though to the senses in the world they do seem to be thus located. Rather, they are located in the interior things which correspond to time and place. The things which correspond to them cannot be called anything else than states, for no other term exists to describe the things that correspond to time and place. A change of state in interior things is said to take place when the affections and resulting thoughts in a person's mind or disposition (mens seu animus) undergo change, as when sadness turns to joy, or joy back to sadness, when ungodliness turns to godliness or devotion, and so on. These changes are called changes of state and are attributable to affections and, insofar as thoughts are governed by these, to thoughts also. But the changes of state which thoughts held within affections undergo are like those of individual parts within their general wholes, compared with which they are variations.