Unde malum — whence evil? — is one of the oldest and most persistent questions in philosophy and theology. Tertullian was asking it in the third century. We are still asking it now. The question has a certain quality that marks out the genuinely important philosophical problems: it is simple to state, profound to engage with, and resistant to clean resolution.
The question matters differently depending on where you stand. For the atheist, evil is a feature of the natural and social world that needs to be understood and reduced. For the theist, it presents something more urgent: a tension at the heart of belief in an all-powerful, all-knowing, perfectly good God. If such a God exists, evil requires explanation. The history of theology is, in part, the history of attempts to provide one.
Let's be precise about what we mean by evil — because the word covers very different things.
Moral evil is evil arising from human agency: cruelty, violence, deception, exploitation. The Holocaust. Slavery. A child abused by someone entrusted with their care. These are evils that humans do to each other, and they are the domain where free will arguments have most traction.
Natural evil is suffering that arises not from human action but from the indifferent operation of the natural world: tsunamis, childhood cancer, earthquakes, genetic diseases, the death by starvation of millions of animals over billions of years of evolutionary history. This is the harder category for theology. Free will does not cause earthquakes.
The theological responses divide broadly into several camps, and it's worth taking each seriously rather than dismissing them.
The free will defence is the most widely invoked: God gave humans free will because a world of genuinely free beings who choose good is better than a world of automata compelled to it. Evil is the price of freedom. This is a serious argument and, for moral evil, it has genuine force. A world without the possibility of cruelty is also a world without the possibility of genuine kindness. The capacity for one may require the capacity for the other.
But the free will defence doesn't obviously extend to natural evil. Cancer in a three-year-old is not the consequence of anyone's free choice. An omnipotent God could, in principle, have created a world with human freedom and without earthquakes. The argument has to do further work than it usually performs.
The soul-making theodicy, associated with the philosopher John Hick, takes a different approach: suffering is not an error in creation but a feature of it. We develop morally and spiritually through difficulty. Compassion requires something to be compassionate about. Courage requires something to be afraid of. A world without adversity would produce different people — perhaps shallower ones. On this view, natural evil serves a developmental purpose.
I find this argument more interesting than many critics do, but it has a significant problem: the scale and distribution of suffering seems wildly disproportionate to any developmental purpose. The suffering of millions of children who die of preventable diseases before they can develop morally at all is difficult to accommodate within a soul-making framework. An omnipotent God choosing this mechanism, when other mechanisms were presumably available, requires us to attribute to God a pedagogical approach that we would consider monstrous in a human teacher.
The inscrutable purposes theodicy — God's reasons are beyond human comprehension — is theologically common and philosophically unsatisfying. It is unfalsifiable by design: any amount of evil can be accommodated by this framework, which means it provides no information about anything. It is the option that ends inquiry rather than advancing it.
From a secular perspective, the question of where evil comes from has a different shape. Moral evil is explicable through evolutionary psychology, social structures, and individual psychology: humans are capable of extraordinary cruelty because we are also capable of extraordinary in-group loyalty, and the line between the two is less distinct than we'd like. The capacity to torture an outgroup member and the capacity to sacrifice oneself for a family member may share deep psychological roots. Understanding this doesn't excuse evil; it explains its origin.
Natural evil — suffering caused by non-human forces — isn't evil in a moral sense at all from a secular viewpoint. It is simply the indifferent operation of natural processes that predate and will outlast human consciousness. A tsunami isn't malevolent. A cancer cell isn't cruel. The categories of good and evil don't apply to them. The suffering they cause is real and matters enormously — but it doesn't require a cosmic explanation, only a practical response.
What the secular account must answer is a different question: if evil is not a cosmic category but a human one, what grounds our judgement that certain things are evil? This is the territory of moral philosophy — and it is genuinely hard. But it is a different problem from the one theology faces, and I would argue a more tractable one.
The question of evil is one of the places where I think philosophy does its most important work. Not because it produces clean answers — it doesn't — but because engaging seriously with it forces precision about what we believe and why. The theist who has wrestled with the problem of evil and arrived at faith anyway is doing something more philosophically serious than one who has never considered it. And the atheist who takes the problem of evil as a simple disproof of God and walks away is missing the centuries of serious work theologians have done to grapple with it.
Evil is real. Suffering is real. The question of what these facts mean — about the universe, about God, about us — remains genuinely open. And that, perhaps, is the most honest thing that can be said.