What does the Bible teach about the purpose of evil?

The existence and purpose of evil are challenging concepts, yet Scripture asserts that God is not the author of evil but can turn it for good. Isaiah 45:7 states that God forms light and creates darkness, indicating His ultimate control over both. The trials and tribulations caused by evil often serve to showcase God's glory and grace, particularly in the lives of the elect. Romans 8:28 reminds us that all things, including evil, work together for good for those who love God, affirming that God's sovereign plan remains intact through every circumstance.