The book of Job is a great one to study, it helped lead me to salvation because as a non-believer. I struggled greatly with the issue of suffering in the world and it's cause. For me, a turn was made reading the book of Job. Many non-believers blame God for their suffering and if they have had hard lives depart from Him for good. You see people like this out there, hardened faces and who are very sad and have given up all hope. Many remain angry at God for their entire lives.
In fact illness, poverty and other harsh life events led me to wrongly believe that God did not love me when I was a young adult. Watching the wicked prosper in this world with no biblical training leads many down a false path. Seriously in my case, my thoughts were that Christianity was for nice bright shiny people who had it all together and the false church system helped with this. Reading the book of Job was a life-saver on multiple levels. There are many lost people out there stuck in that trap, of not realizing God's love because of wrong thinking regarding the suffering in this world and their own.
One issue that continues to concern me out there, is I see all these graphics onlining that God will bring people wonderful lives here on earth and that troubles me, because what happens if there is hardship or losses? No preparation is made for tribulation with these teachings. This is where the "God has a plan for you" stuff misinterpreted can bring many hard things to people and internal suffering and turmoil.
Many people including Christians have lost just about everything in this world or have bodies that don't work right, or have faced incredible grief, the book of Job while to many on the surface seems to be one of the harshest books of the Bible, to me it is not, it is a book of Hope in God that tells a person while suffering happens one is not always to blame for it, and that in the end God will lift you up. It also details the tests of faith. Of course Job prefigured Jesus Christ in many ways too as this graphic shows.