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.

“The eyes are the windows of the soul.” That's a sentiment with roots somewhere in murky antiquity, but one that has become hopelessly cliché because it is both poetic and obviously true. We feel that if we can look in someone's eyes, we can truly know what they are inside. And it's not just the eyes; really it is the face as a whole that conveys this. As Swedenborg puts it, the face is “man's spiritual world presented in his natural world” (Heaven and Hell, No. 91). Our faces reveal our interior thoughts and feelings in myriad ways, which is why psychologists, poker players and criminal investigators spend so much time studying them. It makes sense, then, that people's faces in the Bible represent their interiors, the thoughts, loves and desires they hold most deeply. We turn our faces to the ground to show humility when we bow in worship; we turn them to the mountains when seeking inspiration; we turn them toward our enemies when we are ready to battle temptation. When things are hard, we need to “face facts,” or accept them internally. When the topic is the Lord's face, it represents the Lord's interiors, which are perfect love and perfect mercy. And when people turn away from the Lord and refuse his love, it is described as the Lord “hiding his face.”

(References: Heaven and Hell 91)