Why does God allow some to remain in darkness?

In the sermon, it is emphasized that the worst thing God can do is leave an individual in their natural state of ignorance and unbelief. This implies a deep theological truth about the nature of sin and God's judgment. In the case of Judas Iscariot, he was left to follow his sinful inclinations, culminating in his ultimate destruction. God’s sovereignty encompasses His decision to allow individuals to remain in darkness, which serves both to highlight His justice and the consequential nature of sin. This does not negate God's mercy, but rather accentuates the importance of grace for those whom He chooses to illuminate.