36. "Now
indeed, Elizabeth your relative has also conceived a son in her old age; and
this is now the sixth month for her who was called barren.
37. For with God nothing will be impossible."
38. Then
Mary said, "Behold the maidservant of the Lord! Let it be to me according to
your word." And the angel departed from her.
(Luke 1:36-38, NKJV)
Elizabeth, the mother of John, had not been able to bear children her whole life. Now, she was "well advanced in years" (Luke 1:7). Furthermore, her husband Zacharias admitted to being "an old man" (Luke 1:18). Yet, she conceived a son. Elizabeth's pregnancy was a sign to Mary that, although she was a virgin, she would indeed bear a son by the power of God (Luke 1:34-35).
Notice carefully how Mary said the "impossible" would be accomplished. She had faith these things would occur to her "according to your word" (v. 38). Things that are "impossible" with man are accomplished according to the word of God, not contrary to it. Do not expect God to act against His word; He will not. Instead, when you rely on and obey God's word, great things will be accomplished that defy human wisdom, will and power.