Daily Aquinas – Day 19 🎓
The Quote
"Evil is the absence of good which is natural and due to a thing."
Summa Theologiae I, Question 49, Article 1
The Teaching
Revelation — established yesterday as reason's necessary anchor — illuminates truths that reason alone distorts or abandons. Among the most misunderstood is the nature of evil itself. The problem of evil is perhaps the oldest weapon aimed at belief in a good God. Aquinas meets it head-on, and his answer reframes the entire question.
Evil is not a thing. It has no independent substance, no nature of its own, no existence apart from the good it corrupts. Evil is a privation — the absence of a good that ought to be present in a particular nature. Blindness is not a positive entity; it is the absence of sight in a creature whose nature is ordered toward sight. Cruelty is not a substance inhabiting a man; it is the absence of right order in a will that was made for love. This is not wordplay — it is a metaphysical claim with enormous consequences.
If evil were a substance with independent existence, then God — who creates all substances — would be the author of evil. Aquinas denies this root and branch. God creates only being, only goodness. Evil enters not by creation but by defect: when a created will turns away from the good it was ordered toward, or when a created nature fails to achieve the perfection proper to it. The source of moral evil is always a deficient will, not a creative act of God.
This also explains why evil is parasitic on good. Absolute evil — a thing totally devoid of all goodness — cannot exist, because existence itself is a good. The most corrupt man still possesses being, intellect, and will — goods from which he has not yet been entirely stripped. Evil can only corrupt; it cannot create. It feeds on the good it destroys, which is why it tends toward its own annihilation.
What does this mean practically? Suffering, loss, and sin are real — Aquinas never minimizes them. But they are not equal powers ranged against God in a cosmic duel. They are wounds in a creation that remains fundamentally good, inflicted by wills that remain fundamentally free. The response to evil is not despair at a universe gone wrong, but the restoration of order — in the soul, in relationships, in society — to the good from which it has fallen away.
For Reflection
Where is evil currently being treated as a rival power or independent force — something to be merely endured or escaped — rather than as a privation of good that right order, grace, and the will can move against and repair?
