Genesis 24:16

This is not written of her in vain. Nevertheless the meaning of the statement disturbs me: "She was a virgin, whom no man had known." It is indeed as if a virgin were something other than one whom a man has not touched. And what does the addition seem to mean in reference to a virgin that it should be said, "A man had not known her"? Is there indeed another virgin whom a man has touched?I have often said already that in these stories history is not being narrated but mysteries are interwoven. I think therefore that something such as this is indicated in this story.
Just as Christ is said to be the husband of the soul, to whom the soul is married when it comes to faith, so also, contrary to this, he who also is called "an enemy" when "he sows tares among the wheat" is called the husband to whom the soul is married when it turns away to faithlessness. It is not sufficient, therefore, for the soul to be pure in body; it is necessary also that this most wicked man "has not known it." For it can happen that someone may possess virginity in body, and knowing that most wicked man, the devil, and receiving darts of concupiscence from him in the heart destroy the purity of the soul. Because, therefore, Rebekah was a virgin "holy in body and spirit," for this reason the Scripture doubles her praise and says, "She was a virgin; a man had not known her."

Therefore, Isaac is a true blessing, full of grace, and a source of joy. To this source, Rebecca came to fill her water jug. For the Scripture says that as she went down to the spring, she filled her jug and went up again (Gen. XXIV, 16). So she went down to the fountain of wisdom, whether the Church or the soul, to fill her entire vessel and to draw from the pure disciplines of wisdom that the Jews refused to draw from the flowing fountain. Who is this fountain, listen to the one saying: They have abandoned me, the fountain of living water (Jeremiah II, 13). To this fountain ran the thirsting soul of the prophets, as David also says: My soul thirsts for the living God (Psalm XLI, 3); so that it could quench its thirst with the richness of divine knowledge and wash away the blood of foolishness with the flow of spiritual waters.