What does the Bible say about mourning and comfort?

In Matthew 5:4, Jesus teaches that mourning is a blessed state because it leads to comfort. This mourning refers to a deep sorrow over one's sin and the spiritual state before God. To mourn is to recognize our spiritual poverty and wretchedness, as exemplified by the Apostle Paul, who cried out about his own unworthiness (Romans 7:24). This is not a self-centered grief, but it centers around the offense to God’s holiness and the sufferings of Christ, which reveal the depth of our sin. Thus, those who mourn for their sins are promised the comfort of God’s grace and forgiveness.