The bible says you must believe that God is and He is a rewarder of them that diligently seek Him. To believe that God is requires faith. Why is it that children believe without any problems? While adults have trouble believing at all. Could it be that our free will gets in the way? Or maybe it is knowledge that’s the problem. Jesus said if we don’t believe like a child, we can’t enter into the kingdom. Mary understood that the time of the messiah was near. She believed God and trusted that He would provide. She wasn’t expecting that God would choose her. God chooses faith over circumstances. When Gabriel appeared to Mary, she had a choice, to believe or not. Mary chose faith and believed. Gabriel told her a little about what would happen, but she had to walk it in faith, even to the death of her son. God requires Faith.