5817. 'And so it was, when we went up to your servant my father' means a raising up to spiritual good. This is clear from the meaning of 'going up' as a raising up, dealt with below; and from the representation of Israel, to whom 'father' refers here, as spiritual good from the natural, dealt with in 4286, 4598. A raising up of the kind meant here by 'going up is a movement towards more internal things; here it is a raising up from the truths in the natural, which are represented by 'Jacob's ten sons', to spiritual good from the natural, represented by 'Israel'. For there is an exterior natural and there is an interior natural, 5497, 5649. The interior natural holds spiritual good, which is 'Israel', while the exterior natural holds the truths known to the Church, which are 'Jacob's sons', and therefore 'going up to their father' means a raising up of these to spiritual good.

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.