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The problem of evil is widely regarded as the most powerful challenge to theistic belief. If God is omnipotent (all-powerful), omniscient (all-knowing), and omnibenevolent (all-loving), why does evil and suffering exist? This question has provoked some of the most profound and anguished philosophical and theological reflection in the history of thought. This lesson examines the logical and evidential forms of the problem, the major theodicies (attempts to justify God in the face of evil), and the philosophical evaluations of each.
The ancient Greek philosopher Epicurus (341–270 BCE) formulated the problem with devastating simplicity:
J.L. Mackie (1917–1981) formalised the logical problem of evil in "Evil and Omnipotence" (1955). Mackie argued that the following three propositions are logically inconsistent — they cannot all be true simultaneously:
If God is omnipotent, God has the power to eliminate evil. If God is omnibenevolent, God has the desire to eliminate evil. Yet evil exists. Therefore, either God is not omnipotent, not omnibenevolent, or does not exist at all.
Key Definition: Theodicy — From the Greek theos (God) and dike (justice). A theodicy is an attempt to justify God's goodness and power in the face of the existence of evil and suffering.
Philosophers distinguish between two types of evil:
| Type | Definition | Examples |
|---|---|---|
| Moral evil | Evil caused by the free choices of moral agents | Murder, theft, cruelty, genocide, war |
| Natural evil | Evil caused by natural processes, not by human agency | Earthquakes, disease, floods, animal suffering |
The distinction matters because different theodicies address these types differently. The free will defence can potentially explain moral evil but struggles to explain natural evil.
William Rowe (1931–2015) developed the evidential problem of evil, which does not claim that God's existence is logically impossible but argues that it is highly improbable given the amount and distribution of suffering in the world.
Rowe pointed to cases of gratuitous suffering — suffering that appears to serve no purpose and leads to no greater good. A fawn trapped in a forest fire, suffering for days before dying, is Rowe's famous example. Such suffering appears entirely pointless — it does not build character, teach moral lessons, or lead to any greater good. If even one instance of genuinely gratuitous suffering exists, then God (as traditionally conceived) does not exist.
St Augustine of Hippo (354–430) developed one of the most influential theodicies in Christian theology.
Augustine argued that evil is not a thing in itself — it has no positive existence. Evil is a privation (absence or corruption) of good, just as darkness is the absence of light and disease is the absence of health. God created everything good; evil entered the world through the misuse of free will.
Augustine traced the origin of evil to the Fall — the rebellion of angels (led by Lucifer) and the subsequent disobedience of Adam and Eve in the Garden of Eden. God created a perfect world, but free beings chose to turn away from God, introducing sin and its consequences (suffering, death, natural evil) into creation.
Augustine taught that the guilt of Adam's sin was transmitted to all subsequent human beings through Original Sin. All humanity is "seminally present" in Adam and shares in his guilt. Natural evil — disease, earthquakes, death — is part of the punishment for this collective sin.
| Element | Augustine's Position |
|---|---|
| Nature of evil | Privation of good — not a positive reality |
| Origin of evil | The Fall — free choice of angels and humans |
| Natural evil | Consequence of the Fall — punishment for Original Sin |
| God's justice | God is justified in allowing suffering because humanity deserves punishment |
| God's mercy | God offers redemption through Christ — salvation is possible |
Criticisms of Augustine's Theodicy:
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