Luke 1:37- "For no word from God will ever fail."
Imagine her sitting alone, minding her own business, when suddenly an angel comes to her with a message. He clearly tells her that she's been chosen by the most holy God to carry the savior of the world. I'm sure she had a moment where she had to pinch herself to make sure she wasn't dreaming. Then, once she realized this was really happening, I wonder if she was terrified. In her culture, she could be stoned for having a baby without being married! No one would understand. No one would believe her. She would be the outcast of the town.
Yet... in spite of the culture, her friends and family, her betrothed... she was willing. Her response? "I am your servant. May your word to me be fulfilled." (v.38) We aren't told of a ten-minute discussion with the angel about why God should choose the married woman down the street or about how young she was... There was no screaming or whining or begging. Her response was simply this: Yes, Lord.
How was Mary about to respond in such a way? Faith. Mary truly believed, in the deepest part of her heart, that "no word from God ever fails." She knew that God had the perfect plan and that He uses willing and faithful and pure people to fulfill it.
I wonder if she knew, truly knew, the magnitude of this calling. Do any of us ever really know? Pray that God will open your eyes to the work of His hands. And be willing to say yes.