Nor does it matter, whether one or two Isaiahs wrote the book which bears that Prophet's name; the Church, without settling this point, pronounces it… - John Henry Newman

Firmly I believe and truly
God is Three, and God is One;
And I next acknowledge duly
Manhood taken by the Son.

It is then an integral portion of the Faith fixed by Ecumenical Council, a portion of it which you hold as well as I, that the Blessed Virgin is Theotocos, Deipara, or Mother of God; and this word, when thus used, carries with it no admixture of rhetoric, no taint of extravagant affection,—it has nothing else but a well-weighed, grave, dogmatic sense, which corresponds and is adequate to its sound. It intends to express that God is her Son, as truly as any one of us is the son of his own mother.

It would seem, then, that there is something true and divinely revealed, in every religion all over the earth, overloaded, as it may be, and at times even stifled by the impieties which the corrupt will and understanding of man have incorporated with it. Such are the doctrines of the power and presence of an invisible God, of His moral law and governance, of the obligation of duty, and the certainty of a just judgment, and of reward and punishment being dispensed in the end to individuals; so that revelation, properly speaking, is an universal, not a partial gift.