Donald Mcleod on the virgin birth:
The virgin birth is posted on guard at the door of the mystery of Christmas; and none of us must think of hurrying past it. It stands on the threshold of the New Testament, blatantly supernatural, defying our rationalism, informing us that all that follows belongs to the same order as itself and that if we find it offensive there is no point in proceeding further.
But what is the significance of the virgin birth? David Mathis offers four reasons:
One, it highlights the supernatural life of Jesus on earth. He was born supernaturally, he also came back from the dead supernaturally.
Second, it shows that humanity desperately needs saving and its guilt and sin are so profound that the savior has to come from the outside.
Third, the virgin birth shows God’s initiative to save humanity. The angel announced that Mary was to get pregnant; he didn’t ask for permission.
Lastly, the virgin birth hints the dual nature of Christ, that he is both human and divine. He is human in that he was born of a human mother naturally, and he is fully divine in that his conception was miraculous.