7644. 'And they will cover the surface of the land' means the lowest levels of the natural mind. This is clear from the meaning of 'the surface' as the external and so lowest levels; and from the meaning of 'the land', here 'the land of Egypt', as the natural mind, dealt with in 5276, 5278, 5280, 5188, 5301.

5089. 'And they were in custody for days' means that they lay in a state when they were cast aside for a long time. This is clear from the meaning of 'days' as states, dealt with in 23, 487, 488, 493, 893, 2788, 3462, 3785, 4850; so that 'for days' here means lying in a particular state for a long time - in a state when they were cast aside, meant by 'custody', 5083. A more lengthy explanation of the details contained in the internal sense here is not possible because they are not the kind of matters about which any idea can be gained with the help of things in the world, such as details about the celestial-of-the-spiritual man, about this man's state within the natural when the interior natural is being made new, and after that when it has been made new and the exterior natural has been cast aside. But some idea of these matters and others like them can be gained from things in heaven, which is the kind of idea that does not pass into any notion gained from things in the world, except in the case of people who, in their thinking, can be led away from sensory impressions.

[2] Unless a person's thought can be raised above sensory impressions so that these are beheld as existing so to speak beneath him, he cannot possibly discern any interior aspect of the Word, let alone things of heaven such as are totally removed from those of the world, since the senses take hold of them and stifle them. This explains why people who rely on their senses and have focused their attention on known facts rarely understand anything about the things of heaven; for they have immersed their thoughts in the kinds of things that belong to the world, that is, in terms and in definitions formed from these, and so in what the senses perceive, from which they can no longer be raised up and so preserved in a way of looking at things that is higher than the senses. Nor can their thought range freely any longer over the whole field of matters recorded in the memory, selecting those which agree and casting aside those which are contrary, and using those which are in any way appropriate. For their thought is locked up and immersed in terms, as has been stated, and consequently in sensory impressions, so that it cannot look round about. This is the reason why the learned possess less belief than the simple, and also indeed why they possess less discernment in heavenly matters. For the simple can view something from a position that is above mere terms and above known facts, and so above sensory evidence. This the learned cannot do; their viewpoint is based on terms and known facts because their mind is immersed in these. Thus they are bound so to speak in a dungeon or prison.