236. II. Spiritual cold in marriages is a disunion of souls and a disjunction of minds, whence come indifference, discord, contempt, disdain, and aversion; from which, in several cases, at length comes separation as to bed, chamber, and house. That these effects take place with married partners, while their primitive love is on the decline, and becomes cold, is too well known to need any comment. The reason is, because conjugial cold above all others resides in human minds; for the essential conjugial principle is inscribed on the soul, to the end that a soul may be propagated from a soul, and the soul of the father into the offspring. Hence it is that this cold originates there, and successively goes downward into the principles thence derived, and infects them; and thus changes the joys and delights of the primitive love into what is sad and undelightful. 237. III. THERE ARE SEVERAL SUCCESSIVE CAUSES OF COLD, SOME INTERNAL, SOME EXTERNAL, AND SOME ACCIDENTAL. That there are several causes of cold in marriages, is known in the world; also that they arise from many external causes; but it is not known that the origins of the causes lie concealed in the inmost principles, and that from these they descend into the principles thence derived, until they appear in externals; in order therefore that it may be known that external causes are not causes in themselves, but derived from causes in themselves, which, as was said, are in inmost principles, we will first distribute the causes generally into internal and external, and afterwards will particularly examine them.