How do we know the doctrine of the virgin birth is true?

The doctrine of the virgin birth is a cornerstone of Christian faith, rooted in biblical prophecy and New Testament affirmations. Isaiah 7:14 states, 'Therefore the Lord himself shall give you a sign; Behold, a virgin shall conceive and bear a son, and shall call his name Immanuel.' This prophecy indicates the extraordinary nature of Christ's incarnation, as God sent His Son into the world through a miraculous conception by the Holy Spirit. Additionally, the Gospel of Luke recounts the angel Gabriel's announcement to Mary, affirming that the Holy Ghost would come upon her. The fulfillment of this prophecy underscores the truth of Jesus' divine nature and His unique role in salvation history.