LUKE 1:26-38
The virgin birth is unexplainable except as a miracle. There is no way possible for a virgin to have a baby, but with God all things are possible.
The Bible reveals that there are some things that are impossible: Hebrews 6:18 says that it is impossible for God to lie; it was impossible for satan to keep Jesus in the grave, Acts 2:24; and it is impossible to please God without faith, Hebrews 11:6.
Anything that God has promised in His Word is possible. His Word not only proclaims what He's willing and able to do, but it also carries His power to accomplish it.
The word of the Lord Gabriel brought to Mary had the power to produce the virgin birth. When she believed it, her faith set God's Word into motion.
It doesn't matter how impossible it may look, if we pray according to His Word, then the power it takes to accomplish the answer is contained in it. Mixed with faith, nothing that God has promised is impossible