“The holy Fathers do not hesitate to call the holy Virgin Theotókos, not in the sense that the divine nature of the Word took its origin from the holy Virgin, but in the sense that he took his holy body, gifted with a rational soul, from her. Yet, because the Word is hypostatically united to this body, one can say that he was truly born according to the flesh.”
Cyril of Alexandria
If you are interested in more quotes on Virgin Mary, you can find them in Mary and the Fathers of the Church on Amazon in both Kindle and paperback formats.
References:
Gambero, L., 1999. Mary and the Fathers of the Church 1st ed. Translated by Buffer, T., San Francisco: Ignatius Press.
Virgin Mary 
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