Here are some resources that explain the contrast principle and the problem of evil.
- Unmerited suffering and God by Drew Costen
- The contrast principle by Savior of All Mankind
- God is the Placer of Evil by Scott Hicko
- God, the Author and Finisher of Evil by Scott Hicko
- Evil Leads to Salvation by Scott Hicko
- God told us about EVIL by Scott Hicko
- Evil’s Conclusion: The Justification of Sin by Scott Hicko
- The Problem of Evil and the Judgments of God by A.E. Knoch
- The Problem of Evil by Seeking Truth
- Don’t worry, evil is absolutely necessary by Savior of All Mankind
- Why God allows suffering. by Rest_in_grace (feat. Jason)
- Do you ever feel forsaken by God? by Rest_in_grace
- MF 7: The Problem of Evil by DCTime