What precisely does “I’ll take the side of the Nestorians...” mean?
For those who are unfamilar with Nestorianism:
Nestorianism
From Wikipedia, the free encyclopedia
Nestorianism is the doctrine that the two individual natures of Christ, the human and the divine, are joined in conjunction (”synapheia”) rather than in hypostatic union.[1] The doctrine is identified with Nestorius (c. 386–c. 451), Archbishop of Constantinople. This view of Christ was condemned at the First Council of Ephesus in 431, and the conflict over this view led to the Nestorian schism, separating the Assyrian Church of the East from the churches adherent to the First Council of Ephesus, among them being the Roman Catholic Church, the Eastern Orthodox Church, and the Oriental Orthodox Church.
Nestorianism originated in the Church in the 5th century out of an attempt to rationally explain and understand the incarnation of the divine Logos, the Second Person of the Holy Trinity as Jesus Christ. Nestorianism taught that the human and divine essences of Christ are separate and that there are two natures, the man Jesus and the divine Logos, united in Christ. Consequently, Nestorians rejected such terminology as “God suffered” or “God was crucified”, because the humanity of Christ which suffered is separate from his divinity. Likewise, they rejected the term Theotokos (Giver of birth to God/Mother of God) as a title of the Virgin Mary, suggesting instead the title Christotokos (Giver of birth to Christ/Mother of Christ), because in their view he took only his human nature from his mother, while the divine Logos was pre-existent and external, so calling Mary “Mother of God” was misleading and potentially wrong.