2. Before treating of the New Jerusalem and its doctrine, something shall be said of the New Heaven and the New Earth. In the small work on The Last Judgment and the Destruction of Babylon it was shown what is meant by the "first heaven and the first earth" which had passed away. After they had passed away, and thus after the Last Judgment had been accomplished, the new heaven was created, that is, formed by the Lord. This heaven was formed of all those who after the Lord's advent even to the present time, had lived a life of faith and charity; since they alone were forms of heaven. For the form of heaven, according to which all consociations and communications are there effected, is the form of Divine Truth from the Divine Good which proceeds from the Lord; and this form a man puts on as to his spirit by a life according to Divine Truth.

That the form of heaven is from this source, may be seen in the work Heaven and Hell 200-212; and that all angels are forms of heaven, in Heaven and Hell 51-58, 73-77. From this it may be known, of whom the new heaven was composed, and hence also what its quality is; namely, that it is altogether of one mind; for he, who lives a life of faith and charity, loves another as himself, and through love conjoins him to himself, and thus reciprocally and mutually, because love in the spiritual world is conjunction. When, therefore, all act alike, then from many, yea, from countless numbers consociated according to the form of heaven, there arises one mind, and there results, as it were, a one; for there is nothing which separates and divides, but everything conjoins and unites.

9717. 'Square shall the altar be' means that which for this reason is righteous. This is clear from the meaning of 'square' as what is righteous, dealt with below; and from the meaning of 'the altar' as what is representative of the Lord and of the worship of Him, so that 'square shall the altar be' means what is righteous within the Lord, and consequently within worship. Worship is called righteous when the good and the truth contained within it spring from the Lord and not from the person, for the Lord alone is the source of that which is righteous, 9263. The meaning of 'square' as what is righteous has its origin in representative signs in the next life. There forms of good present themselves as round shapes, and forms of good belonging to the external man, which are called righteous acts, as square shapes. Truths and right ideas however present themselves as linear and triangular ones. So it is then that 'square' means what is righteous, as does the squareness of the altar of incense, Exodus 30:2; also the squareness of the breastplate of judgement when doubled, Exodus 28:16; as well as the new Jerusalem's being square-shaped, Revelation 21:16. The new Jerusalem there is the Lord's New Church which will take the place of the one that is ours at the present day, its external good, which is righteous, being meant by 'square-shaped'.