Arcana Coelestia#656
656. 'The door in the side' means hearing. This is by now quite clear and so there is no need to confirm it by similar examples from the Word. For the relationship of the ear to inner sensory organs is like that of a door at the side to a window above, or what amounts to the same, the relationship of hearing, which is the function of the ear, to the understanding, which is the function of an inner sensory power.
Genesis 6:2
2
that God's sons saw that men's daughters were beautiful, and they took for themselves wives of all that they chose.