To acknowledge the Church means not merely to dream of Christ, but to live as a Christian—to walk the path of love and self-denial. Faith in the Church demands a feat of both the human mind and the human will. Truth and salvation are granted to the love of the Church—that is, to the Church itself; such is the consciousness of the Church. Latinism (Catholicism), having fallen away from the Church, betrayed this consciousness and proclaimed: "Truth is given to the individual person of the Pope, and the Pope (of Rome) administers the salvation of all." Protestantism objected to this: "Why is truth given only to the Pope?" and added: "Truth and salvation are revealed to every individual person independently of the Church." Every single person (in Protestantism) was elevated to the status of an infallible pope... Protestantism substituted the reason of the individual for faith, and replaced salvation within the Church with a fanciful assurance of salvation through Christ apart from the Church—in a state of self-loving isolation from everyone else... Protestantism openly proclaimed this greatest of falsehoods: that one can be a Christian without acknowledging any Church...
Christ’s entire earthly mission should not be viewed merely as a teaching. Christ did not come to earth simply to impart a few new truths to mankind; no, He came to create a new life for humanity—that is, the Church. Christ Himself said that He establishes the Church (Matt. 16:17). This new human community, in the view of its Creator, differs fundamentally from all other forms of human association. Christianity is not merely an abstract doctrine to be accepted intellectually and held by individuals in isolation. Rather, Christianity is a shared life in which individual persons are united to such an extent that their union can be likened to the unity of the Persons of the Holy Trinity.
The Church is the Kingdom of God, a kingdom not of this world (John 14:27, 15:19, etc.)... The Holy Spirit, dwelling within the Church, empowers each member to become a "new creation" and to be guided by love in their life.
The Church cannot and must not serve state interests or considerations, nor any goal other than the single purpose indicated by her sole Head—Christ—and inherent within her own nature... The Church cannot descend to the level of the state without betraying her fundamental character and forfeiting her freedom and holiness; conversely, the state must not arrogate to itself the authority or attributes of the Church, nor treat the Church as a subordinate instrument. To do so would introduce falsehood and hypocrisy into both the secular and ecclesiastical spheres and undermine the Church's authority. History offers numerous examples of the evils that invariably resulted from the Church’s interference in state affairs, the union of spiritual and secular authority, and the concentration of both the spiritual and the temporal sword in a single hand—in short, the clothing of the Church in the armor of state power. In such instances, eternal, absolute divine truth is stifled by the contingent truth of the state, reduced to the level of a mere "official interest," and branded with the stamp of officialdom. Here, nothing is possible but falsehood, deceit, hypocrisy, disrespect for the Church, and apostasy from faith.
Translated from his writings which can be found here in Russian:
https://drive.google.com/file/d/1W8of6PEyDU1Aauttk9qmmPvo3pfH-cWO/view?usp=drive_link