Read: Luke 1:39-45
And blessed is she who believed that there would be a fulfillment of what was spoken to her from the Lord." (Luke 1:45 ESV)
Belief is powerful. It steers people to do amazing, wonderful, and sometimes terrible things. It shapes to core of what, how, and why we think the things we think. 20th century pastor, theologian, and author A.W. Tozer in his book Knowledge of the Holy wrote, "What comes into our minds when we think about God is the most important thing about us."
Mary showed the quality of her belief. There was no mere lip service or emotional hype on her part. There was complete and utter devotion to her Lord and his call on her life to be the mother of Jesus. Her cousin Elizabeth proclaimed under the power of the Holy Spirit that she was blessed for it.
Blessing may not always look like you think it will. Honestly, it probably rarely will. God doesn't rain financial prosperity and material possessions on people simply because they choose to follow him. In fact, for many he probably works to help them see the reality of a blessing apart from those things. After all, as Christians we love and worship Jesus, a homeless traveling preacher.
As a further example of great faith look to the mother of our Lord. She believed and was blessed for it.