This is from Tim’s Walking with God Through Pain and Suffering book. I highly recommend it.
According to Christian theology, suffering is not meaningless—neither in general nor in particular instances. For God has purposed to defeat evil so exhaustively on the cross that all the ravages of evil will someday be undone and we, despite participating in it so deeply, will be saved. God is accomplishing this not in spite of suffering, agony, and loss but through it—it is through the suffering of God that the suffering of humankind will eventually be overcome and undone. While it is impossible not to wonder whether God could have done all this some other way—without allowing all the misery and grief—the cross assures us that, whatever the unfathomable counsels and purposes behind the course of history, they are motivated by love for us and absolute commitment to our joy and glory. So suffering is at the very heart of the Christian faith. It is not only the way Christ became like and redeemed us, but it is one of the main ways we become like him and experience his redemption. And that means that our suffering, despite its painfulness, is also filled with purpose and usefulness. Tim Keller