I’ve got to say, I think many of you are missing the message of the song entirely. The question the song explores is: “*How *can a woman possibly fathom the mystery incarnate in the Christ, much less in being the *mother *of that very Christ?”
We ought to agree to this much: that Mary was a human being, with the thoughts and emotions and limitations that are entailed by humanness. (So was Jesus, although perhaps “limitations” ought not apply when one has chosen those limitations). Mary was not a Scripture scholar, and it is very unlikely that she had the idea that the Messiah would die an agonizing death.
Let’s look at what Scripture tells us she knew:
He will be great and will be called the Son of the Most High. The Lord God will give him the throne of his father David, and he will reign over the house of Jacob forever; his kingdom will never end."
There is no indication that she was anything but joyous before Jesus was born, although there is a sense of some anxiety when we hear (in Jesus’ childhood) that she “kept all these things in her heart”. This is likely due to Simeon’s prophecy:
Then Simeon blessed them and said to Mary, his mother: “This child is destined to cause the falling and rising of many in Israel, and to be a sign that will be spoken against, so that the thoughts of many hearts will be revealed. And a sword will pierce your own soul too.”
We have no reason to suppose that Mary received any other extraordinary revelations, although it is certainly likely that she “knew”, in some sense, that “when she kissed her little baby, she kissed the face of God”. And yet…
How could she *know *such a thing? That is, how could she comprehend it? Who can fathom the glory of the Most High, and who can take in God under her own humble roof? There is a richness of mystery here, which cannot simply be swept away by answering the song’s questions with “Yes”.
My own humble belief: Mary did not know, in any amount of fullness, the power and the glory and the majesty of God until Jesus died on the Cross. For only then the curtain was torn; only then could we truly behold His glory, as we had the freedom to walk into the Holy of Holies and yet live! Mary was the first to take that step, but I highly doubt she was fully aware of her calling before the very end.