Thou art all fair O Mary, and the original stain is not in thee. O Mary! Thou art a garden enclosed, a fountain sealed up...
"The deepening of faith in the virginal motherhood led the Church to confess Mary's real and perpetual virginity even in the act of giving birth to the Son of God made man. In fact, Christ's birth "did not diminish his mother's virginal integrity but sanctified it." And so the liturgy of the Church celebrates Mary as Aeiparthenos, the "Ever-virgin." - CCC
"Who is this gate (Ezekiel 44:1-4), if not Mary? Is it not closed because she is a virgin? Mary is the gate through which Christ entered this world, when He was brought forth in the virginal birth and the manner of His birth did not break the seals of virginity." (St. Ambrose of Milan, The Consecration of a Virgin and the Perpetual Virginity of Mary, 8:52; c. 391 AD)
"For the Lord has created a new thing on the earth - A woman shall encompass a man." (Jeremiah 31:22).