Why did Jesus have to be born of a virgin?

The virgin birth of Jesus is fundamental in affirming His deity and the fulfillment of Old Testament prophecy. According to Luke 1:35, the Holy Spirit overshadowed Mary, allowing Jesus to be born without the taint of original sin. This unique birth is crucial in demonstrating that Jesus is fully God and fully man, being the perfect and sinless Savior who can atone for the sins of His people. This mystery highlights God's sovereign plan in the incarnation and assures believers that their redemption is grounded in a Savior who is both divine and human.