In Exodus 14:2, this signifies the beginning of a state for undergoing temptations. (Arcana Coelestia 8130)

60. Verse 31 And God saw everything that He had made, and behold, it was very good. And there was evening, and there was morning, a sixth day.

This verse says 'very good', whereas previous verses merely said 'good', for now the things of faith make one with those of love. A marriage has accordingly taken place between spiritual and celestial things.