I said the other day that it's not fair my daughter died while others have healthy babies. While I do still feel that way, I shouldn't complain. I don't know why I have to suffer grief, but I know why Mary did:
Mary had to suffer grief because of my sin.
That fact alone draws me to my knees in repentance. Add to that the fact that our sin separates us from the one true God but He did what it took to enable reconciliation, well, I feel like I'm constantly on my knees (at least, my heart is. Does a heart have knees? Ah well, I'm sure you understand what I mean).
Romans 3:23-24 - For all have sinned and fall short of the glory of God, and all are justified freely by his grace through the redemption that came by Jesus Christ.
Romans 5:8 - While we were still sinners, Christ died for us.