37. It is said that the luminaries shall be "for signs, and for seasons, and for days, and for years." In these words are contained more arcana than can at present be unfolded, although in the literal sense nothing of the kind appears. Suffice it here to observe that there are alternations of things spiritual and celestial, both in general and in particular, which are compared to the changes of days and of years. The changes of days are from morning to midday, thence to evening, and through night to morning; and the changes of years are similar, being from spring to summer, thence to autumn, and through winter to spring. Hence come the alternations of heat and light, and also of the productions of the earth. To these changes are compared the alternations of things spiritual and celestial. Life without such alternations and varieties would be uniform, consequently no life at all; nor would good and truth be discerned or distinguished, much less perceived. These alternations are in the Prophets called "ordinances" [statuta], as in Jeremiah:
Said Jehovah, who giveth the sun for a light by day, and the ordinances of the moon and of the stars for a light by night, . . . these statutes shall not recede from before me (Jer. 31:35-36). And in the same Prophet:
Said Jehovah, If My covenant of day and night stand not, and if I have not appointed the ordinances of heaven and earth (Jer. 33:25). But concerning these things, of the Lord's Divine mercy, at Genesis 8:22.
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