There is nothing arbitrary or accidental in God's moral kingdom; nothing which violates responsibility and truth. Everything, in being established in the truth, is established in the wisdom of permanent law or nature; and nothing exists or is done by unreasonable will or by unmeaning chance. The love of union, which draws together and makes kindred spirits into one, has its nature. It loves existences, because it desires to make them good; it both loves them and unites with them when they are made good. It has its nature; it has its triumphs also. It is triumphant, both because it conquers by the might of its attractive power, and also because it is happy. The union of souls... cannot fail to constitute the highest happiness. They do not love in order to be happy; but they are happy because they love. The union of holy souls in love is the nuptials of the spirit. Their happiness is as bright and as pure as the love from which it flows. Extracted from the exhaustless mine which constitutes God's happiness, it ls indeed the pearl of great price; the gem which illustrates the walls of the New Jerusalem.
Thus among holy beings there is one great circle of relationship. Love alone, in its mighty power, works out the problem of universal harmony. The fact of holiness, which is but another name for pure or holy love, constitutes a bond of union; reaching all, encircling all, beautifying all. Those in the same rank of being are attracted to each other; and all are attracted to that which is higher in rank; not only loving, but united in love; and united each in his place and order, on the combined principle of extent of being and perfection of character. So that the result is — God in all, and all in God; the Father in Christ, and Christ in those who are begotten of him; mutually bound together and living in each other; no more separated in fact, and no more capable of being separated from each other than the rays of the light are separated or capable of being separated from the natural sun.
— A Treatise on Divine Union (1851) Part 4, Chapter 5.