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.

8940. 'And if you make for Me an altar of stones' means a representative kind of worship in general that is composed of truths. This is clear from the meaning of 'an altar' as a representative of Divine worship in general, dealt with in 921, 2777, 2811, 4489; and from the meaning of 'stones' as truths, dealt with in 643, 1298, 3720, 3769, 3771, 3773, 3789, 3798, 6426, 8609. There is worship of the Lord that springs from good, and there is worship of Him that springs from truth. Worship of the Lord springing from good was represented by an altar of soil, and worship springing from truth by an altar of stone. Regarding the first and the second kinds of worship, see above in 8935. It was because an altar of stone was a sign of worship springing from truth that they were commanded to set up such an altar as soon as they crossed the Jordan and came into the land of Canaan, and to write on it the Commandments contained in the Law, that is, God's truths from heaven. For by the Ten Commandments are meant all God's truths in summary form. That altar is spoken of in Moses as follows,

When you cross the Jordan you shall set up for yourself large stones, and coat them with lime. Then you shall write on them all the words of the Law. Afterwards, you shall build there an altar to Jehovah your God, an altar of stones, which you shall not hew with any iron tool. ¹ With whole stones you shall build the altar of Jehovah your God, and present ² on it burnt offerings and eucharistic offerings. And you shall write on the stones of the altar the words of the Law, expressing them very plainly. Deuteronomy 27:1-8; Joshua 8:30-32.

[2] The reason why they were to write the words of the Law on stones of the altar was that truths were meant by 'stones', and worship that springs from truths by 'an altar of stones'. This was also the reason why the Ten Commandments, which were a sign of Divine Truths in their entirety, were inscribed on tablets of stone. The reason why it had to be done as soon as they crossed the Jordan was that the Jordan, which was the first and outermost boundary of the land of Canaan on the side where the wilderness lay, meant introduction into the Church or heaven, which is accomplished through cognitions or knowledge of truth and good, thus through truths from the Word, 4255. For all the rivers serving as boundaries of that land meant the first and outermost reaches of the Lord's kingdom, 4116, 4240. By 'the stones of the altar' the truths of faith are also meant in Isaiah,

He will remove sin when He makes all the stones of the altar like chalk-stones scattered about. Isaiah 27:9

This refers to the ruination of the Church. 'The stones of the altar like chalk-stones scattered about' stands for the truths of faith that inspire worship after something similar has happened to them. As regards altars in general, they were made out of soil, stones, bronze, wood, and also gold - out of bronze, wood, and gold because these materials served to mean good. For an altar of bronze, see Ezekiel 9:2; for an altar of wood, Ezekiel 41:22; and for an altar of gold, which was the altar of incense, 1 Kings 6:22; 7:48; Revelation 8:3. That 'bronze' means good, see 425, 1551; that 'wood' does so, 643, 2784, 2812, 3720, 8354; and that 'gold' does so as well, 113, 1551, 1552, 5658.

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