Matthew 5:4 NIV84

Mourners who are coming to understand the reality of how "poor in spirit" they are... will be comforted. It would seem here that God gives special blessing to those who have come to terms with their need. All who have gone through a significant mourning period in their lives are familiar with the reality of the desperation one feels during these times. When we are desperate we tend to call out to God to stop the pain...to help us through the pain... It's the humiliation of coming to the end of ourselves and realizing that we need outside help to process the pain of mourning. It is understandable why God would bless those who are desperately sad... In their sadness, they are expressing a deep level of heart cry, which often leads to a prayer of desperation, which seems to quicken God's grace to comfort. When we are week... He is strong! When we realize our spiritual bankruptcy, and mourn over it, God is strong in and through us. So, blessed are those who mourn, because they will be comforted with the very presence of God.