There are a lot of terrible things that happen in the world, even in our own lives. How do we account for inexplicable suffering, sadness, bad situations that are not getting better? If you don’t have a doctrine of the fall of mankind, which broke the world and cursed it, these questions must eat away at your view of the competency of God at being God. After all, why can’t he superintend the world well enough to keep such disasters from happening, why do thing suddenly go wrong for no apparent reason? But if you believe the world is deeply broken because of a primordial act of rebellion against God, then suffering becomes intelligible as a part of the fall out of that original act of rebellion. People suffer because this world is broken by sin.