 Alvin Plantinga's free-will defense

Alvin Plantinga's free-will defense is a philosophical argument designed to address the problem of evil, particularly the challenge posed by the existence of gratuitous suffering in a world created by an all-powerful, all-knowing, and all-good God. The problem of evil raises the question of how such a God could permit the existence of evil and suffering. Plantinga's free-will defense asserts that one possible reason for the existence of evil is that God granted humans free will.