1618. 'And there he built an altar to Jehovah' means worship as the outcome of that state. This is clear from the meaning of 'an altar' as the representative of all worship in general, dealt with already in 921. Worship in the internal sense means all conjunction by means of love and charity. A person is worshipping all the time if love and charity abide in him, external worship being only the outward expression of it. Such is the worship of angels, and therefore with them the sabbath never comes to an end; and this in turn explains why in the internal sense 'the sabbath' means the Lord's kingdom. While a person is in the world however he ought certainly to participate in external worship as well; for it is by external worship that internal things are aroused, and by means of external worship external things are kept holy so as to enable internal to flow in. Furthermore a person is endowed with cognitions by this means, and is made ready to receive celestial things, and also has states of holiness conferred on him, though he is not conscious of this. These states of holiness are preserved by the Lord for his use in eternal life; in fact all the states of his life reappear in the next life.

Dust, in Ezekiel 26:12, signifies the lowest things which are of the sensual principle of man. They can be either good or bad, depending on the context.

In Isaiah 40:12, the dust signifies exterior or natural truths and goods of heaven and the church.

In Genesis 2:7, the dust is good, and we see some interesting nuances:

First, there's this: 'To form the man, dust from the ground' is to form his external man, which had not previously been man... (Arcana Coelestia 94)

Here, this formation of our external body and mind is a precursor, setting the stage for God to "breathe into our nostrils".

In Arcana Coelestia 1610, we find this passage, where again, dust has a good signification:

'Dust of the earth' has regard to those things that are celestial, for, as shown already, 'the earth' means the celestial aspect of love; 'dust of the sea' has regard to those things that are spiritual, for 'the sea', as has also been shown, means the spiritual aspect of love; while 'as the stars of heaven' means both but in a higher degree. And because these things cannot be numbered they therefore became common expressions to describe growth and multiplication beyond measure.

Then, in Arcana Coelestia 3707, these ideas get pulled together:

The reason the dust of the earth symbolizes goodness is that the earth, [or land,] symbolizes the Lord’s kingdom and therefore goodness, as shown just above in §3705. The dust of that land, then, means goodness, but earthly goodness, since the land symbolizes what is lowest in the Lord’s kingdom....

But there are bad connotations, too. In Micah 7:14-17, licking dust symbolizes being only sensual - bodily and external, worldly, and selfish. It's much the same in Psalms 72:9, where "Barbarians will bow down before God, and His enemies lick the dust...". See Arcana Coelestia 249, 3413 for interesting explanations of this.

(Odkazy: Apocalypse Explained 1145)