I've always had this understanding of evil and pain in the world that's sufficed for my own faith and relationship with God as reason for the bad things that happen. Sin, evil, free will, and the understanding of "already but not yet" - God's kingdom not yet fully realized here as it is in heaven.

But more and more, as I see hard, ugly things, and I see how my own explanations don't suffice for others' personal understandings or questions, I ache more for this "kingdom" to come. For the victory to be full and for complete victory over sin and death. We grow weary of struggles with sin and pain; longing for God's kingdom to come, on earth as it is in heaven.