So in this surprise moment where Gabriel appears to Mary, we discover that we struggle to grasp and surrender ourselves to the vast kindness of God in the gospel. God proved his intentions to Mary, a virgin, were good in granting her that miraculous pregnancy. The son born was a thrilling blessing and advantage to Mary and you you and I by extension. The son born was fully human as well as fully divine. It is important that the son is fully human because he is the true Christian's representative obedience, substitute sacrifice, mediator between God and men, ruler over creation, example in life, pattern of glorification, sympathetic high priest, and all of these forever- So you are called upon to worship and trust this Son with joy today because he is everything you need to live a well-adjusted life before God and men, forever.