According to Jewish mysticism, the souls of a husband and wife originate in the same undifferentiated spiritual essence. These souls are bound as one, and the purpose of marriage is to enable a couple to manifest this unity in the context of everyday life.

Rabbi Yitzchak Ginsburgh shows how the natural process of mating of establishing a healthy relationship, fostering togetherness, and ultimately merging into true oneness--is a spiritual act of the highest order.

Drawing on modern psychology and Kabbalistic wisdom, with many illustrations from Biblical personalities, the author traces...