The number "four" in the Bible represents things being linked together or joined. This is partly because four is two times two, and two represents the ultimate linking between our desire to be good and our understanding of truth. We can also see this in the fact that most buildings are rectangular, with the four sides linking together to make a whole. We also divide directions into four -- north, east, south and west -- and talk about the "four corners" of something meaning all of it. So our special thinking naturally looks at four sides as linking together into a whole.

(Verweise: Apocalypse Explained 417; Arcana Coelestia 1686, 9103, 9601, 9767, 9864)

9864. 'There shall be four rows of stones, the order being' means all of them joined together, that is to say, all the truths springing from good. This is clear from the meaning of 'four' as a joining together, dealt with in 1686, 9601, 9674; and from the meaning of 'rows of stones' as truths springing from good in their proper order. The setting of them in four rows, three in each row, was decreed in order that the joining together of all the truths springing from the same good, and so their perfection, might be represented; for 'four' means a joining together, as has been stated, and 'three' means perfection, 9825. Indeed since one and the same good is the source from which they all emanate, 9863, and is consequently the one to which they all look back, that good is what joins them all together.

[2] Things that happen in heaven may serve to cast light on all this and show that it is so. All without exception in heaven turn their face towards the Lord; and - marvel that it is - this happens whatever direction they turn to face. As a consequence of this all who are in heaven are joined together as one. But those who are outside heaven turn their face away from the Lord; and the further away they are from heaven the further away their faced is turned. As a consequence of this there is division among them, because they do not love God or their neighbour, only themselves and the world. But this is an arcanum which for those whose thought is ruled by the illusions of the senses is inconceivable; for they cannot at all comprehend how every face in heaven can be always looking, in whatever direction its owner turns, towards the Lord, who is the Sun there. See what has been introduced above in 9828 on this subject.