If there had not been this kind of Word on our earth, the humanity of our earth would have separated itself from heaven, and once separated from heaven would no longer have had any rational ability. Our human rational ability in fact arises from an inflow of light from heaven.
We on this earth are by nature incapable of accepting any direct revelation and being taught about divine truths by that means, unlike the inhabitants of other planets ([whose abilities] have been dealt with in their own separate booklet). We more than they are engrossed in worldly concerns and therefore in superficial matters, while it is the deeper levels that are open to revelation. If the outer levels were receptive, we still would not understand the truth.
This nature of people on our earth is clearly visible in members of the church. Even though they know from the Word about heaven, hell, and life after death, they still deny these things at heart. This includes people who have made a name for themselves for outstanding learning, who you would think would therefore be wiser than others.
I have talked with angels about the Word on occasion, and have told them that it is looked down on by some people because of its pedestrian style. They know absolutely nothing about its deeper meaning and therefore do not believe that this kind of wisdom lies hidden within. The angels have told me that even though the style of the Word may appear pedestrian in its literal meaning, it is qualitatively incomparable because divine wisdom lies hidden not just in the overall meaning but in every word, and that this wisdom shines out in heaven. They have wanted to declare that because it is divine truth, it is heaven’s light, since divine truth in heaven is radiant (see Section 132, published November 27, 2016).
They have added that without this kind of Word there would be no light of heaven among the people of our earth and consequently no union with heaven for them; for the amount of heaven’s light there is among us determines the union and therefore the extent to which we have any revelation of divine truth through the Word. The reason people do not know this union exists (through the spiritual meaning of the Word corresponding to its natural meaning) is that the people of our earth do not know anything about angels’ spiritual thinking and conversation. They do not know that this is different from our natural thinking and conversation; and anyone who does not know this cannot possibly know what the inner meaning is and therefore cannot know that it can make this kind of union possible.
They have also said that if we knew that this kind of meaning existed and when we read the Word did our thinking with any knowledge of it, we would come into a deeper wisdom and be more closely united to heaven, because in this way we would have access to concepts like those of angels.
from Heaven and Hell, Sections 309, 310