7408. 'And they gathered them into heaps [upon] heaps' means that those false reasonings were arranged into bundles in the natural. This is clear from the meaning of 'being gathered into heaps [upon] heaps' as being arranged into bundles. Those reasonings are 'gathered into heaps' because all the contents of a person's mind have been arranged into series, and into bundles so to speak, and then into series within series, or bundles within bundles, see 5339, 5530, 5881. The fact that they are arranged in this kind of way is evident from the way that all things are arranged within the body. There fibres can be seen arranged into bundles, and glands into clusters. This arrangement exists everywhere within the body, and in a much more perfect manner with the more refined substances that are not visible to the naked eye. That bundling allows itself to be seen especially in the brain, in the two substances there, one of which is called cortical, the other medullary; and it exists no less with those more refined substances, and lastly the most refined, where the forms that receive them are the actual forms receptive of life.

[2] The fact that forms or substances are receptive of life may be recognized from every detail to be observed in living things. It may also be recognized that recipient forms or substances are arranged or structured in the most appropriate way for the inflow of life. If life were not received by substances, that is, forms, there could be no living thing in the natural world, nor any in the spiritual world. Series of extremely fine threads, resembling bundles, are what constitute those forms. They likewise are receptive of life, and within those forms undergo perfect modification. For modifications depend on the forms, that is, substances, in which they occur and from which they arise; for the substances or forms determine what the modifications shall be. The reason why the learned have come to envisage the things that constitute a person's life - the contents of his thought and will, for example - as entities without recipient substances or forms is that they have come to believe that life or the soul is either something flame-like or something air-like, and so the kind of thing that will be dispersed after death. This accounts for the insane notion of a large number of them that there is no life after death. From all this one may see how to understand the explanation that the false reasonings were arranged into bundles in the natural.

5497. 'And it was in the mouth of his pouch' means that it was returned as a gift and was put back in the opening of the exterior natural. This is clear from the meaning of 'the mouth of the pouch' as the opening of the exterior natural. Its having been put back there is implied from its very presence there, while its return as a gift follows from what was stated immediately before this, that no power of their own had been expended. Because 'the pouch' was in the preliminary part where the sack opened, nothing else is meant by 'the pouch' than the preliminary part of the receptacle, which is the exterior natural since this too is a preliminary part - 'a sack' being a receptacle, see 5489, 5494. So that anyone may know what the exterior natural and the interior natural are, let a further brief statement be made about them.

[2] One who is still a child cannot begin to think from anything higher than the exterior natural, for he composes his ideas out of sensory impressions. But as he grows up, employing sensory impressions to work out the reasons for things, he begins to think from the interior natural. For he begins to employ his sensory impressions to formulate ideas about truths which essentially are higher than sensory impressions; yet such ideas are still on a level with things in the natural world. But as he grows into a young adult, if he develops his power of reason, he employs what is in his interior natural to work out the reasons for things, which are truths of a yet higher nature. These are extracted so to speak from what is present in the interior natural. (The learned world calls the ideas composing thought which originate in this way intellectual and immaterial ideas, whereas ideas formed from factual knowledge present in both parts of the natural, insofar as these originate in the world and come through the senses, they call material ideas.) This is the manner in which a person rises with his understanding from the world up to heaven. Yet he does not go on into heaven with that understanding unless he accepts good from the Lord which is constantly present and flowing into him. If he does accept that good he is also endowed with truths, for in good all truths are welcome guests. And as he is endowed with truths, so he is endowed with understanding enabling him to have his being in heaven.