We are all destined to suffer in this life; it’s unavoidable. But why do some have to suffer so much more than others? One answer may be that suffering is not necessarily an evil in God’s eyes. He uses suffering to draw those who are seeking truth to Himself. Security, prosperity and the pursuit of pleasure frequently do just the opposite. People who have everything they could ever want are often miserable to the point of burying themselves under destructive obsessions in their attempt to escape reality.
       Even more to the point, the horrific level of suffering found in this world isn’t God’s doing at all. People bring most of it on themselves, since rejection of God’s purpose sets the stage for evil to flourish. As evil people gain control over the lives of others, suffering is unleashed on an unbelievable scale. It can always be traced to back sin.

From: The Path through the Maze—Answering Life’s Ultimate Question: What Happens After We Die?