Augustine's engagement with the problem of evil was not a detached philosophical exercise — he spent years in Manichaeism, which taught that evil was a coeternal principle opposed to God, before his conversion convinced him otherwise. His decisive answer, developed across the Confessions, Enchiridion, and City of God, was that evil has no independent substance: it is the privation or corruption of good (privatio boni), existing only as good's diminishment. This privation theodicy — the technical term for Augustine's framework — directly answers the Manichaean dualism he had abandoned: if evil is not a substance but an absence, there is no need to posit a coeternal evil principle, and God's sovereignty over creation remains intact. The framework shaped Anselm, Aquinas, and the entire Western theological tradition on how to reconcile God's goodness with the reality of suffering and sin.
Augustine describes his breakthrough realization that evil is not a substance but the absence of good, reached after reading Platonist philosophy: "I saw that you made all things good, and there are no substances at all that you did not make... and there is no substance that is evil." This became the foundation of his mature theodicy.
In his systematic handbook for Laurentius, Augustine states the privation theory plainly: evil is not a nature but "the privation of good, even to the point of complete nonentity." He adds that God's power is shown precisely in bringing good out of evil rather than being defeated by it.
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