Arcana Coelestia #61
61. Everything that has to do with cognitions of faith is called spiritual, and everything that has to do with love to the Lord and towards the neighbour is called celestial. The former belong to man's understanding, the latter to his will.
Fluctuations of the ark
Fluctuations of the ark, as in Genesis 7, signify the changes of state during spiritual regeneration.
(References: Arcana Coelestia 785, Genesis 7:18)