Therefore, the Lord himself shall give you a sign; Behold a virgin shall conceive, and bear a son, and shall call his name Immanuel. (Isaiah 7:14 KJV)
Anyone who has ever spent any time near or around people celebrating Christmas have heard this verse. Matthew refers to it pointing out the fulfillment of a prophecy by the Mesiah, the King of the Jews, evidenced in the child Jesus born of a virgin by the name of Mary. Matthew looked into the scriptures with the Holy Ghost guiding his hand, and he made a connection as to the fulfillment of this prophecy.
But what is so astounding about this is the fact that God chose to fulfill this prophecy.
What do I mean by this?