THE CHURCH is called One, Holy, Catholic, and Apostolic; because she is one, and holy; because she belongs to the whole world, and not to any particular locality; because by her all mankind and all the earth, and not any particular nation or country, are sanctified; because her very essence consists in the agreement and unity of the spirit and life of all the members who acknowledge her, throughout the world; lastly, because in the writings and doctrines of the Apostles is contained all the fullness of her faith, her hope, and her love.
From this it follows that when any society is called the Church of Christ, with the addition of a local name, such as the Greek, Russian, or Syrian Church, this appellation signifies nothing more than the congregation of members of the Church living in that particular locality, that is, Greece, Russia, or Syria; and does not involve any such idea as that any single community of Christians is able to formulate the doctrine of the Church, or to give a dogmatic interpretation to the teaching of the Church without the concurrence therewith of the other communities; still less is it implied that any one particular community, or the pastor thereof, can prescribe its own interpretation to the others. The grace of faith is not to be separated from holiness of life, nor can any single community or any single pastor be acknowledged to be the custodian of the whole faith of the Church, any more than any single community or any single pastor can be looked upon as the representative of the whole of her sanctity. Nevertheless, every Christian community, without assuming to itself the right of dogmatic explanation or teaching, has a full right to change its forms and ceremonies, and to introduce new ones, so long as it does not cause offense to the other communities. Rather than do this, it ought to abandon its own opinion, and submit to that of the others, lest that which to one might seem harmless or even praiseworthy should seem blameworthy to another; or that brother should lead brother into the sin of doubt and discord. Every Christian ought to set a high value upon unity in the rites of the Church: for thereby is manifested, even for the unenlightened, unity of spirit and doctrine, while for the enlightened man it becomes a source of lively Christian joy. Love is the crown and glory of the Church.
by Alexei Khomiakov, 1804–1860