the union of the Logos with Sophia

In his Mariology, [Leonardo] Boff quotes an enormous amount of literature. Nevertheless, one cannot help wondering why he avoids mentioning two authors who are both close to his basic intentions, but develop it in an orthodox form: Teilhard de Chardin, with his vision of the Eternal Feminine (commented by Cardinal de Lubac), and Louis Bouyer's bold thesis, influenced by Russian Sophiology, in which he holds that the entire world process rests upon the union of the (descending) Logos with Sophia (ascending to Mary). With both authors, the virginal motherhood of Mary presents the last and highest flowering of Sophia striving upward within the world process, just as Christ presents the definitive Incarnation of the Logos, increasingly made concrete by the same process. Both, accordingly, do not form two hypostatic unions, but precisely that nuptial "toward each other," which St. Paul (Eph 5) and the entire tradition describe in countless Christian commentaries on the Canticle of Canticles.

Hans Urs von Balthasar, Test Everything, p. 45-46