God didn't stop at giving specific prophecies surrounding Jesus' birth - He fulfilled every single one. He set the stage to declare His Son as the Messiah, using people who didn't know Him and decisions that weren't made for Him to fulfill His purposes. The anthem throughout all of history is God's faithfulness. And if God went to such great lengths to see that the promises of His Son were fulfilled, He will continue to go to incredibly great lengths to see the promises that He has spoken for our lives come to pass as well.