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Objection 13 · Natural evil

Earthquakes have no free will.

The objection, in full

The free-will defense, even granted, only covers moral evil — what humans do to each other. It says nothing about the tsunami, the cancer cell, the child born with a genetic disease that kills her at four. No one chose these. They are built into the fabric of the world an omnipotent, omniscient, perfectly good creator chose to make.

If a good God made the world, why has it gone wrong?
— C.S. Lewis (citing the objector before answering)

or, in plain terms —Earthquakes and cancer aren't anyone's fault. So why does God allow them?

Thomas Aquinas
scholastic, the Five Ways
1225–1274

Evil is not a thing. It is the absence of a good that ought to be there.

Blindness is not an entity competing with sight; it is the lack of sight in something made to see. Cancer is not a creature; it is a disordering of cells made for order. When we ask "why did God create this evil?" we have already misstated the question. God creates being, and being is good. Evil is what happens when being falls short of itself.

Why does God permit such falling-short in the natural order? Because he created a world of secondary causes — a world in which fire genuinely burns, plates genuinely shift, cells genuinely divide — rather than a world of constant miraculous intervention. A universe of stable causes is the precondition for any creaturely action at all. Remove the stability, and you remove the creature.

This does not make the suffering small. It locates it. Natural evil is the cost of a world in which finite beings genuinely act. The alternative is not a better world but no world.

Citations Summa Theologiae I.48–49 (on evil as privation) · Summa Contra Gentiles III.71
Ad maiorem Dei gloriam