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3 And God blessed the seventh day, and sanctified it: because that in it he had rested from all his work which God created and made.
To be fruitful relates to goodnesses, and to be multiplied, truths.
(References: Arcana Coelestia 1014, 1018)
16 God made the two great lights: the greater light to rule the day, and the lesser light to rule the night. He also made the stars.