What does the Bible say about mourning and joy?

In John 16:20, Jesus emphasizes that while His disciples will weep and lament, their sorrow will ultimately be turned into joy. This transformation is central to the Christian faith, illustrating how the sorrow of sin and death can be redeemed through the victorious work of Christ on the cross and His resurrection. The resurrection is the pivotal event that affirms God's acceptance of Christ's sacrifice, providing an irrefutable hope that changes our mourning into joy. Just as a woman forgets her pain at childbirth once the joy of new life arrives, so too does our sorrow dissipate in the light of Christ’s victory over sin and death.