St. Nicholas Greek Orthodox Church

In the 10th century, an emissary of Prince Vladimir of Kiev wrote to him upon experiencing the Orthodox Christian worship of the great church of Hagia Sophia in the Byzantine capitol of Constantinople, "We no longer knew whether we were in Heaven or on earth, for such beauty we know not how to tell of it."

THE ATTRIBUTES OF THE CHURCH
The attributes of the Church are innumerable because her attributes are actually the attributes of the Lord Jesus Christ, the God-man, and, through Him, those of the Triune Godhead.(Eph.1:22-23)
Just as the Lord Christ cannot have several bodies, so He cannot have several Churches. (1Corth.1:10-13)
Therefore, according to her theanthropic (Divine/human) nature, the Church is one and unique, just as Christ the God-man is one and unique. A division. a splitting up of the Church is ontologically and essentially impossible. Hence, a division within the Church has never occurred - nor indeed can one take place!
Yet, apostasy from the Church has & will continue to occur after the manner of those voluntarily, fruitless branches which having withered ---- fall away from the eternally living theanthropic Vine the Lord Christ (Jn. 15:1-6).
From time to time, heretics and schismatics have cut themselves off and have fallen away from the one and indivisible Church of Christ, and therefore they ceased to be members of the Church and parts of her theanthropic body.

St. John of Damascus

"In heaven, Christ will not ask us why we sinned; He will ask us why we didn't repent."