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.

4009. 'And he gave them into the hand of his sons' means that they were given to truths. This is clear from the meaning of 'sons' as truths, dealt with in 489, 491, 533, 2623, 3373. 'Giving into their hand' means giving them the right of control, for 'the hand' means power, 878, 3387. The truths which are meant by 'sons' in this case are those which are called sensory truths, for what the senses perceive as truths exist as the boundaries of the natural mind. For the natural degree of man's mind communicates on one side with sensory impressions which belong to the body and on the other side with the rational concepts which belong to the rational mind. By means of what lies in between a way of ascent so to speak is provided from sensory impressions which belong to the body, and are open in the direction of the world, up to the rational concepts which belong to the rational mind and are open in the direction of heaven. And in the same manner they provide a way of descent, that is to say, from heaven down to the world. This situation exists only with man. It is this ascent and descent that is dealt with in the internal sense of the chapters at this point in Genesis. And in order that every single thing may be expressed representatively, the rational is represented by Isaac and Rebekah, the natural by Jacob and both his wives, and the sensory awareness by the latters' sons. But since the sensory awareness as the ultimate degree of order incorporates everything prior to it each son represents something general in which those things are present, as shown above.