"Each Christological or Trinitarian heresy contains the seeds of a Church-State relationship inimical to Christian thought and practice"

"Solovyov perceived an inner link between dogma and models of political and social order. For him, it was no surprise that the rash of Byzantine emperors who championed in turn Arian, Nestorian, Monophysite, Monothelite, and Iconoclast heresies, also raised themselves to quasi-divine status and considered the Church and matters of theology to be under their political jurisdiction. Each Christological or Trinitarian heresy contains the seeds of a Church-State relationship inimical to Christian thought and practice:

Heresy attacked the perfect unity of the divine and the human in Jesus Christ precisely in order to undermine the living bond between Church and State, and to confer upon the latter an absolute independence. Hence it is clear why the emperors of the Second Rome, intent on maintaining within Christendom the absolutism of the pagan Sate, were so partial to all the heresies, which were but manifold variations on a single theme."

     Andrew Kuiper, "Solovyov's Russia and the Catholic Church," Church life journal, 26 November 2018.  The quotation is said to come from p. 14 of Solovyov's Russia and the universal church.