Luke 1:34-38 (ESV)
And Mary said to the angel, “How will this be, since I am a virgin?” And the angel answered her, “The Holy Spirit will come upon you, and the power of the Most High will overshadow you; therefore the child to be born will be called holy – the Son of God. And behold, your relative Elizabeth in her old age has also conceived a son, and this is the sixth month with her who was called barren. For nothing will be impossible with God.” And Mary said, “Behold, I am the servant of the Lord; let it be to me according to your word.” And the angel departed from her.
As Mary’s mind (and heart) tried to wrap around this news, she was confused. She didn’t doubt that all of this would take place (“how will this be”) but rather was curious as to how, since she was a virgin. Her asking this doesn’t show a lack of faith but a lack of understanding. So, as Gabriel filled her in – “the power of the Most High will overshadow you” – he also gave an example of God’s power – “Elizabeth in her old age has also conceived.”
Mary then stepped out in faith. What a huge, exemplary step that was! Surely she must have felt the weight of what was to come. Surely she knew the snickers that would be muttered behind her back. Surely she knew the accusations that would be made about her conduct and her character. Nonetheless, in faith, she stepped out and said, “I am the servant of the Lord; let it be to me according to your word.” Oh to have a faith like that, a faith that surrenders our own reputation to the Lord and rests in his!