The Church has always professed her belief in the perpetual virginity of Mary. The most ancient texts, when referring to the conception of Jesus, call Mary simply "virgin", inferring that they considered this quality a permanent fact with regard to her whole life.
The early Christians expressed this conviction of faith in the Greek term aeiparthenos "ever virgin" created to describe Mary's person in a unique and effective manner, and to express in a single word the Church's belief in her perpetual virginity. We find it used in the second symbol of faith composed by St Epiphanius in the year 374, in relation to the Incarnation: the Son of God "was incarnate, that is, he was generated in a perfect way by Mary, the ever blessed virgin, through the Holy Spirit" (Ancoratus, 119,5; DS 44).
The expression "ever virgin" was taken up by the Second Council of Constantinople (553), which affirms: the Word of God, "incarnate of the holy and glorious Mother of God and ever virgin Mary, was born of her" (DS 422). This doctrine is confirmed by two other Ecumenical Councils, the Fourth Lateran Council (1215) (DS 801) and the Second Council of Lyons (1274) (DS 852), and by the text of the definition of the dogma of the Assumption (1950) (DS 3903) in which Mary's perpetual virginity is adopted as one of the reasons why she was taken up in body and soul to heavenly glory.
Mary is virgin before, during and after giving birth
In a brief formula, the Church traditionally presents Mary as "virgin before, during and after giving birth", affirming, by indicating these three moments, that she never ceased to be a virgin. Of the three, the affirmation of her virginity "before giving birth" is, undoubtedly, the most important, because it refers to Jesus' conception and directly touches the very mystery of the Incarnation. From the beginning it has been constantly present in the Church's belief.
Her virginity "during and after giving birth", although implicit in the title virgin already attributed to Mary from the Church's earliest days, became the object of deep doctrinal study since some began explicitly to cast doubts on it. Pope St Hormisdas explains that "the Son of God became Son of man, born in time in the manner of a man, opening his mother's womb to birth [cf. Lk 2:23] and, through God's power, not dissolving his mother's virginity" (DS 368). This doctrine was confirmed by the Second Vatican Council, which states that the firstborn Son of Mary "did not diminish his Mother's virginal integrity but sanctified it" (Lumen gentium, n. 57).
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J.P. II (Pope John Paul II)
(Audience, August 28, 1996)