Book excerpt: The Delights of Wisdom Pertaining to Conjugial Love is a book by Emanuel Swedenborg, a Swedish theologist, scientist, thinker and mystic, here providing a thorough spiritual understanding of marriage love and sex. Excerpt: "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."