9861. 'It shall be square when doubled' means that which is righteous and perfect. This is clear from the meaning of 'square' as that which is righteous, dealt with in 9717. The reason why that which is also perfect is meant is that the breastplate was doubled, and that which is doubled implies all aspects of good and all aspects of truth. What is on the right side implies the good from which truth springs, and what is on the left implies the truth springing from good, 9495, 9604 (end), 9736, thus also the two perfectly joined to each other. This accounts furthermore for the meaning of 'two' as things joined together, 8423, also every single aspect of them, 9166, and their completeness as well, 9103.

9604. 'Five curtains shall be joined together, each one to the next, and five curtains joined together, each one to the next' means unceasing communication of truth with good and of good with truth. This is clear from the meaning of 'five' as all on one side, for 'ten' means all of the whole, 9595; and from the meaning of 'curtains' as interior truths of faith which belong to the new understanding, also dealt with above in 9595. Hence because the ten curtains were joined together five and five, a reciprocal communication of truth and good and of good and truth is meant by them, for the communication between them must be reciprocal, in order that the truth and good may be joined together and be married. They are similar in meaning to things on the left side and those on the right in a human being - to those on the right side in that they have connection with the good from which truth springs, but to those on the left side in that they have connection with the truth that springs from the good. And in the middle between them the communication of good with truth and of truth with good takes place, so that they are perpetually and unceasingly joined together. Such are the realities meant by the words, Five curtains joined together, each one to the next, and five curtains joined together, each one to the next.