The birth of Our Lord, an analogy given was like light passing through glass. God can do anything. Mary is ever virgin.

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"The definition of the Lateran Council in 649 A.D. states that, in addition to conceiving Jesus without the seed of man, that She gives birth to Him ‘without any detriment to Her virginity.’ The Council of course goes on to say that Her virginity "remained inviolable even after His birth."

"Less than fifty years later, at the Council of Toledo, in 693, the Church teaches the doctrine very clearly: ‘And, as the Virgin acquired the modesty of virginity before conception, so also She experienced no loss of Her integrity, for She conceived a virgin, gave birth a virgin, and after birth retained the uninterrupted modesty of an intact virgin.’ This obvious sense of this definition indicates that we are speaking of physical virginity.

"The Fathers of the Church are careful to treat this mystery with reverence and prudential mortification of the tongue. Never do they speak about the physiology of the virginity in regard to Our Lady because, after all, She is the mother of God, and not a scientific case study… Notice the delicacy of St. Ambrose in the 4th century: ‘Mary is the gate through which Christ entered the world when He was brought forth in the virginal birth, and the matter of his birth did not break the seal of virginity.’

Witness also St. Augustine’s faith in the miraculous quality of the virgin birth: ‘That same power which brought the body of the risen Jesus through closed doors brought the body of the Infant forth from the inviolated womb of the Mother.’

"St. Gregory the Great, in the 7th century, makes it clear that the virgin birth is a miracle only comparable to the Resurrection, and one in the face of which reason must give way to faith.

"Finally, all this seems to be fairly simple if we understand that the virgin birth is not a natural but a miraculous birth, matched only by the escape of Jesus from a sealed tomb… The Fathers of the Church tell us, interpretating Isaiah (7:14), that if a virgin conceives and bears a son, that son must be God. The miraculous physical virginity of Our Lady is the fundamental guarantee of the divinity of Christ."