9726. 'And you shall make for it a grating, a network' means the level of sensory perception, which is the last and lowest. This is clear from the meaning of 'a grating, a network' as external sensory perception, thus that which forms for a person the last and lowest level of life; and since this lowest level is meant by the grating it was placed all the way round the altar. Such sensory perception was represented by the grating because it first sifts so to speak and sorts out those things which enter the human mind and present themselves to the understanding and will, namely truths and forms of good. If the sensory perception is composed of good it does not let anything through other than forms of good, and truths derived from good, and rejects evils and the falsities arising from evil. For sensory perception is the actual ability to perceive things which belong to the understanding and to sense those which belong to the will as they exist on outermost levels, an ability that is perfectly fashioned for the affections for those things. The nature of all this may be illustrated by very many things in the body. Everywhere in the outermost parts within the body there are forms that resemble nets and there are so to speak gratings which sort out the things that flow towards them from the world. Those that are suitable are let through because they are desirable, and those that are unsuitable are rejected because they are loathsome. Extremely sensitive systems such as these exist in the stomach. These let through into the blood the suitable juices of the chyle, because these juices are useful and therefore desirable, and reject the unsuitable because they are harmful and therefore loathsome. The situation is similar with sensory perception, which is the last and lowest level of a person's life. But this level with a person has become totally wrecked, the reason why being that it stands right next to and is exposed to the world and is therefore the last to be regenerated, indeed scarcely anyone at the present day is able to be regenerated down to that level. As regards what the level of sensory perception is like with these people, see what has been shown already concerning it in 4009, 5077, 5081, 5084, 5094, 5125, 5128, 5580, 5767, 5774, 6183, 6201, 6310-6318, 6564, 6598, 6612, 6614, 6622, 6624, 6844, 6845, 6948, 6949, 7442, 7645, 7693, 9212, 9216.

Therefore if a person is to see and have an understanding of the truths of faith and the forms of the good of love he must be raised by the Lord above that level to more internal levels. But the sensory perception meant by 'the grating, the network' around the altar is the sensory perception belonging to the Lord's Divine Human, since the altar is representative of the Lord and of the worship of Him that springs from the good of love, 9714.

5096. 'Who were bound in the prison house' means which were among falsities. This is clear from the meaning of 'being bound in the prison-house' as being among falsities, dealt with in 4958, 5037, 5038, 5085. Those who are engrossed in falsities, more so those steeped in evils, are called 'the bound" and 'in prison', not because they are held in any physical bonds but because they are not in freedom; for people who are not in freedom are inwardly in bonds. Indeed once they subscribe to falsity they no longer have any freedom to choose or receive what is true; and those who subscribe heavily to it do not have any freedom even to see it, let alone acknowledge it and believe it, because they are quite convinced that what is false is true and what is true is false. That conviction is so powerful in them that it removes all freedom to think anything different, and is so strong that it holds their actual thought in bonds, in prison so to speak. This has been made clear to me from considerable experience among those in the next life who have become quite convinced of falsity by harbouring ideas that serve to prove to it. They are the kind of people who do not entertain any truths at all but turn or drive these away, doing so with a degree of ruthlessness which matches the intensity of their conviction. This is primarily so when such falsity is the product of evil, that is, when evil causes them to be convinced of it. These are the ones who are meant in the Lord's parable in Matthew,

Other seeds fell on the hard path, and the birds came and devoured them. Matthew 13:4.

'Seeds' means Divine truths, 'hard rock' conviction, and 'birds' false assumptions.

[2] People like these are not even aware that they are in bonds or in prison, for they are full of affection for their falsity, loving it because of the evil which produces it. This leads them to think that they are in freedom, since everything they have an affection for or love seems to make them feel free. But those who have not really subscribed to falsity, that is, who have not become convinced of it, entertain truths easily. They see them, choose them, and are full of affection for them, after which they look down on falsities so to speak, and then see how those convinced of falsity have come to be in bonds. Having such freedom they are able in their contemplation and thought to roam so to speak through the whole of heaven in search of countless truths. But nobody can have this freedom except one who is governed by good; for it is by virtue of good that he is in heaven and by virtue of good that truths are seen there.