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The “Problem” of Evil

By October 2, 2020October 29th, 20202 Comments
Photo by Damon Lam on Unsplash

Throughout the history of Christianity, the presence of evil in the world has stood in stark contrast to the Christian claim of an omnipotent, infinitely good God. This “problem” of evil has always demanded an explanation for the apparent tension.

Simply put, from the point of view of human welfare, pain, suffering, and death ought not to exist. As the Catechism of the Catholic Church succinctly states:

“If God the Father almighty, the Creator of the ordered and good world, cares for all his creatures, why does evil exist? To this question, as pressing as it is unavoidable and as painful as it is mysterious, no quick answer will suffice” (CCC 309).

The Scandal of Evil

The Catechism also relates elsewhere the great test of faith that can come from evil and suffering, recognizing it as a profound temptation against the Gospel message (see CCC 164, 272). Such concerns were present to the mind of St. Thomas Aquinas who, in fact, went so far as to use the presence of evil in the world as one of only two objections in his question on whether God exists in the Prima pars of his Summa theologiae (see I, q. 2, a. 3, obj. 1).

Of course we know, as Thomas replies, that evil does not disprove God’s existence, though it certainly leads some people to question the existence of God. And that difficulty has reared its ugly head again today with the evils of COVID-19 and all of the concerns that raises.

Now, the definitive answer to evil in the world is certainly Good Friday. However, with this series of blog posts I would like to introduce you to Aquinas’ philosophical answer to the problem of evil. Specifically, I will outline in this first post what evil is philosophically (which may surprise you!), while in subsequent posts I will discuss how evil can, in fact, be philosophically reconciled with an omnipotent, infinitely good God.

Definition of Evil

The initial point to note regarding evil is the concept of “privation,” which is what evil is philosophically classified as. Privation is not simply a negation or lack of something, but the negation or lack of something that is in the nature of a thing to have.

The rock, for example, is not privated of sight, because it is not in the nature of a rock to have the power of sight to begin with. The rock lacks the good of sight, but is not privated of the good of sight. Thus, we don’t speak of the lack of sight in the rock as an evil.

But a blind man is privated of sight, for a man is made to see, and thus there is the material evil of blindness. Nor does man possess the good of flight with wings, but that is not a privation because man was not made to have wings. It is not an evil thing to have arms instead of wings when your nature was made with the former and not the latter. But when a man is sick, he suffers the material evil of the privation of the good of bodily health that he ought to have. Or when a man sins, he commits a moral evil by privating himself of the moral goodness that he ought to have.

By this definition we see that evil is not the mere absence of good, but specifically the privation of a good that a thing ought naturally to have.

Does Evil “Exist”?

Given that evil is a privation, it follows that evil is not a positive thing possessing existence itself. An analogy that one will often see is the comparison of evil to a hole in a wall: the hole has no independent existence, but only exists as a part of a wall with something missing.

Put another way, a hole in the wall is not a positive thing in itself: I cannot give you a hole in a wall, you cannot buy one at Home Depot. Thus, a hole in a wall does not per se exist, but what exists is a wall privated of something that it ought to have.

Evil itself is similarly non-existent, nor can there be such a thing as a totally evil thing—evil qua evil—just as a wall that is entirely a hole does not actually exist. Essentially, evil can only exist in good: “goodness” can exist without any “badness,” but “badness” cannot exist without any “goodness.” A “bad” hammer, for example, must at least be good enough to bang a nail, otherwise it wouldn’t be a hammer at all.

Thus, the fundamental premise of a correct philosophy of evil is the surprising reality that evil per se does not actually exist, but rather evil exists as a privation of good.

Part 2

Daniel Campbell

Daniel Campbell graduated in 2004 with a Bachelor of Arts in Psychology and Preprofessional Studies from the University of Notre Dame. After graduation, he worked in medical research for five years in preparation for medical school. However, God called him to a different life when he entered the Catholic Church and received the sacraments of Confirmation and First Eucharist in 2008. Daniel completed his Master's Degree in Systematic Theology at the Augustine Institute in 2012, focusing his studies on the works of St. Thomas Aquinas. He is the Director and Coordinator of Curriculum Development for the Lay Division. In addition to teaching for the Biblical School, Daniel has developed and taught The Art of Living and The Wisdom of the Saints Enrichment Courses. Daniel is married, and he and his wife have four children.


  • Madeleine Prendergast says:

    Thank you for a superb article, Mr. Campbell, written in language that makes it easy to acquire the ideas. I’m glad that you’re splitting your material into several posts, because this is a lot to think about and absorb. Thank you also for the links to the material you reference.

    “Privated”. Instead, what about “deprived”?

  • Diana Ross says:

    Excellent article!

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