An angel appeared to Mary and told her, "You are blessed, because you believed that the Lord would do what he said." (Luke 1:45)
Mary responded, "Oh, how I praise the Lord. How I rejoice in God my Savior! For he took notice of his lowly servant girl, and now generation after generation will call me blessed. For he, the Mighty One, is holy, and he has done great things for me. His mercy goes on from generation to generation, to all who fear him. His mighty arm does tremendous things!" (vs. 46-51)
So, believing that the Lord will do what He says He will do is the path to an amazing adventure with God. This is true for anyone in any generation who is willing to follow Him with faith. My response to this truth, like Mary's response was, is to rejoice and thank Him today for who He is, for all He does, and for inviting me along to be part of the story.
Merry Christmas from my heart to yours.