The Handmaid of the Lord
Luke 1:36-30. And behold, Elisabeth thy kinswoman, she also hath conceived a son in her old age; and this is the sixth month with her that was called barren. For no word from God shall be void of power. And Mary said, Behold, the handmaid of the Lord; be it unto me according to thy word. And the angel departed from her.
The word of God is all-powerful, all-potential, as is proved by the experience of Elisabeth in bringing forth John, and Mary in bringing forth Jesus.