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.

3020. 'Who administered all that he had' means the functions of the natural man. This is clear from the meaning of 'administering', and in particular of 'administering all things', as performing functions or duties. The relationship of the natural man to the rational, or what amounts to the same, of the external man to the internal, is like that of one who administers in a house, see 1795. All things in man are like one house, that is, one family, for there is one who has the duty to be head of the family, and others who have the duty of servants. The rational mind itself is the one that organizes everything, like the head of the family, and by influx brings order into the natural mind. The natural mind however is one that serves and administers. And because the natural mind is distinct and separate from the rational mind, existing on a level below the latter, and also in a sense acts independently, it is called in relationship to the rational 'the servant, the oldest of the house' and 'the one who administered all that he had there'.

[2] The fact that the natural mind is distinct and separate from the rational, existing on a level below it, and in a sense acting independently, becomes clear from the things it has within it, and from the functions it performs. The things it has within it are all facts, and so also all cognitions of every kind - in short, every single thing belonging to the exterior or physical memory, dealt with in 2471, 2480. To this memory also belongs the whole faculty of imagination, which constitutes man's interior sensory awareness and is particularly active with children and during the early stages of adolescence. To the exterior memory belong in addition all the natural affections which man has in common with animals. From this it is evident what the functions of the natural mind are.

[3] The rational mind however is interior. The items of knowledge it has within it, that is to say, every single thing belonging to the interior memory, are not evident to man, but are imperceptible during his lifetime, dealt with in 2470-2474, 2489, 2490. It also has within it the power of thought, which is a perceptivity of what is fair and righteous, as well as of what is true and good. In addition it has all the spiritual affections which are strictly human and which mark man off from animals. From these things within itself the rational mind flows into the natural mind and activates the things that are there, views them with a certain vision, and in this way forms judgements and conclusions. The fact that these two minds are distinct and separate is quite evident from this consideration: With many people the natural mind has dominion over the rational mind, or what amounts to the same, the external man has dominion over the internal; yet it does not have dominion and is subservient only with those in whom the good of charity is present, that is, who allow themselves to be led by the Lord.