High Quality Content by WIKIPEDIA articles! Alvin Plantinga`s version of the free will defense is an attempt to refute the logical problem of evil, the argument that to posit the existence of an omnipotent, omniscient, wholly good god in an evil world constitutes a logical contradiction. Plantinga`s argument (in a truncated form) is that "It is possible that God, even being omnipotent, could not create a world with free creatures who never choose evil. Furthermore, it is possible that God, even being omnibenevolent, would desire to create a world which contains evil if moral goodness requires free moral creatures."