He was despised and rejected by men, a man of sorrows and acquainted with grief; and as one from whom men hide their faces, he was despised, and we esteemed him not. Surely, he has borne our griefs and carried our sorrows; yet we esteemed him stricken, smitten by God, and afflicted.
But he was pierced for our transgressions; he was crushed for our iniquities; upon him was the chastisement that brought us peace, and with his wounds we are healed.
- Isaiah 53:3-5 (ESV)
Martin Luther, a major leader in the Protestant Reformation, taught that we come to know who God is through the cross. This "theology of the Cross" taught that right theology "comprehends the visible and manifest things of God seen through suffering and the cross." While we humans might come up with our own ideas about God and how he acts, Luther rightly recognized that God has stunningly revealed himself through the crucifixion of Jesus Christ.
Jesus' title, Man of Sorrows, deonstrates how Jesus' sorrows bring us joy. Perhaps this seems like a strange topic during Advent, but we must remember that without the cross, Christmas would be hollow.