To reassure Joseph that Mary had not been unfaithful to him, the angel delivered a message containing three amazing statements. Jesus' Conception. "For that which is conceived in her is of the Holy Spirit" (Mt 1:20). Mary was not impregnated by natural means. Her child was the result of a supernatural act of God the Holy Spirit. That's why we call it the virgin birth. Mary was a virgin in every normal sense of the word: She had not had relations with a man. But the Holy Spirit miraculously came upon her, and she conceived a child.
In the Hebrew scriptures, the Holy Spirit often acted as the agent of God's power-the One who carried out the miracles God had planned.
The purpose of the miraculous conception, of course, was to protect Jesus' sinlessness. If Joseph had been the child's physical, natural father, he would hae transmitted his sin nature to the baby. The Redeemer could not possess a sin nature like the rest of us because it would have made Him unfit to become the final sacrifice for our sin and, therefore, unable to redeem us. So God supernaturally caused Jesus to be conceived by the miraculous working of the perfect Holy Spirit so that He would be like "a lamb without blemish and without spot," as the Mosaic Law required" (1Pet 1:19).
His Gender. "She will bring forth a Son" (Mt 1:21). Today a baby's gender is no longer a much-anticipated revelation. We have "gender reveal parties," when moms and dads announce to the world what modern technology has revealed to them about their unborn children.
In those days, however, nobody knew a baby's gender until the child arrived. Only God knew this baby's gender because He had planned for the incarnation of His Son from eternity past. And He revealed that information prior to the child's birth.
His Mission. "You shall call His name Jesus, for He will save His people from their sins" (Mt 1:21). Many people have goals they never obtain due to circumstances that come along in life. Yet before Mary's baby was born, His parents knew exactly what Jesus was going to do: He would be the Savior, which means "Deliverer."
But this Savior did not come to deliver His people rom their enemies. He would not defeat the Roman armies or deliver the Jewish people from persecution or hardship. Rather, the angel specifically said Jesu is would deliver His people from their sins. He would perform a spiritual work, freeing individuals from the penalty of their sins, enabling them to have peace with God and everlasting life.
His Nature. Ironically, the most supernatural element of Christ's birth is the one most missed by an unbelieving world. John said, "In the beginning was the Word, and the Word was with God, and the Word was God. And the Word became flesh and dwelt among us, and we beheld His glory, the glory as of the only begotten of the Father, full of grace and truth" (Jn 1:1, 14).
As far back as we can imagine, when nothing existed but God, the Word existed. Who was the Word? "The Word was with God, and the Word was God." With one-syllable words that nay grade-school student can understand, God has revealed astonishing biblical and theological concepts concerning the Lord Jesus Christ.