This post argues that God and absolute goodness are metaphysically identical, providing a rigorous solution to the classic Euthyphro Dilemma (which asks whether morality is arbitrary or independent of God).
Rather than choosing between those two options, classical theism proposes a third way: God is the standard itself. This claim is built on two primary philosophical pillars:
The Convertibility of Being and Goodness: Classical metaphysics defines "goodness" as the fullness of existence or the successful actualization of a thing's intended purpose. Because evil is not a positive substance but a privation (a lack or malfunction of being, like a crack in a knife), merely existing inherently possesses a degree of goodness. See this short explanation of The Convertibility of the Transcendentals
Divine Simplicity: God does not simply possess good qualities; He is entirely devoid of separate parts or changing attributes. As pure actuality with no unfulfilled potential, God is the ultimate fullness of Being—meaning He is Goodness itself.
The concept that God equals goodness (or vice versa) is a cornerstone of classical theism and Christian philosophy. It is primarily built to solve a classic Euthyphro Dilemma:
* If God commands what is good, is it good simply because He says so (which makes morality arbitrary),
* or is He commanding it because it is already good outside of Him (which means a standard exists higher than God)?
By anchoring goodness directly in the nature of God, philosophers argue that goodness is neither 1) independent of God nor 2) a random whim. Goodness is simply what God is.
This is where people often get tripped up. Saying "to have being is to have goodness" does not mean that everything that exists is morally upright. Philosophers separate this into two categories:
| Type of Goodness | Definition | Example |
| Metaphysical Goodness | The sheer perfection of existing and having functional capacities as a creature. | A tiger has immense metaphysical goodness: it is fast, powerful, and a highly actualized predator. |
| Moral Goodness | How a rational being chooses to direct their capacities in alignment with ultimate truth. | A human being using their intellect to help others rather than harm them. |
Even a deeply corrupt or wicked person still possesses immense metaphysical goodness. They have a mind, a will, life, and existence, all of which are inherently good gifts of being. Their wickedness is not a physical substance inside them; it is a spiritual or moral malfunction, a failure to use their being the way it was designed to be used.
The idea that "being" (existence) and "goodness" are fundamentally the same thing is one of the most elegant, yet mind-bending, concepts in classical metaphysics. It is known as the doctrine of the convertibility of being and goodness (convertibilitas entis et boni).
To understand why medieval philosophers like Thomas Aquinas claimed that merely existing gives something a degree of goodness, you have to shift away from how we use the word "good" today (which is usually a moral or emotional label) and look at it through the lens of metaphysical perfection.
The claim that God equals goodness (or conversely, that ultimate Goodness is identical to God) is not a mere comforting platitude or a lazy definition trick. In the tradition of classical theism, shaped by centuries of Christian, Jewish, and Islamic philosophy, this identity statement is a rigorous metaphysical solution to one of the oldest problems in ethics: the Euthyphro Dilemma.
First raised by Plato in his dialogue Euthyphro, the dilemma asks: Is something good because the gods love it, or do the gods love it because it is already good?
If things are good simply because God commands them, morality becomes arbitrary. If God commanded murder tomorrow, murder would suddenly be "good."
If God is commanding things because they are already good outside of Him, then an independent standard of morality exists higher than God. This means God is not the ultimate reality; He must submit to an external moral law.
Classical theism escapes this trap by rejecting both options. It proposes a third way: God does not look to an external standard of goodness, nor does He invent it on a whim. God is the standard. Goodness is identical to the divine nature.
But how can a personal entity be identical to an abstract moral perfection? To understand this, we have to explore the bedrock of medieval metaphysics.
1. The Core Metaphysics: The Convertibility of Being and Goodness
To modern ears, saying "existence equals goodness" sounds bizarre. We see plenty of existing things—diseases, tyrants, accidents—that we label as "bad." However, medieval philosophers like Thomas Aquinas operated under the doctrine of the Convertibility of the Transcendentals.
Note: The "Convertibility of the Transcendentals" basically means that philosophical idea stating that every aspect of reality, or "being", is fundamentally one, true, and good. These properties are convertible, meaning if you have one, you inherently have all of them. See here or here
In this framework, Being (existence) and Goodness are conceptually distinct, but perfectly identical in reality. They are two sides of the same coin.
Goodness as "Fullness of Being"To understand this, we must define "good" the way the ancients did: a thing is good to the extent that it successfully actualizes its intended nature or purpose. Goodness is completeness; it is the "fullness of being."
Consider an everyday object: a kitchen knife.
What makes a knife a good knife? It has a sharp blade, an ergonomic handle, and structural integrity. These are all positive realities—they represent the "fullness" of what a knife is meant to be.
What makes a knife a bad knife? A dull blade, a cracked handle, or rust. Notice that dullness, cracks, and rust are not "positive substances" created and added to the knife. A crack is a lack of structural integrity. Dullness is a lack of sharpness.
Therefore, badness or evil is always a privation (privatio boni)—a hole, a lack, or a malfunction where being ought to be. Since evil is a negative space (a lack of being), it logically follows that being itself is inherently good. To exist at all is to possess some degree of metaphysical reality, and to possess reality is to possess a degree of goodness.
The Breakdown: Metaphysical Good vs. Moral GoodTo keep your blog readers from getting confused, it is essential to draw a sharp line between two types of goodness:
Metaphysical Goodness: The sheer perfection of existing and possessing functional capacities. A cancer cell or a devastating hurricane possesses immense metaphysical goodness because they are highly active, powerful realities fulfilling their physical natures perfectly.
Moral Goodness: This applies strictly to rational beings with free will. Moral goodness is achieved when a creature uses its metaphysical capacities (like intellect and will) to align with ultimate truth and the design of reality.
When a person acts wickedly, they do not possess a physical substance called "evil." Rather, they are suffering from a moral malfunction—they are taking inherently good things (desire for justice, strength, intellect) and misdirecting them.
2. The Pillar of Divine Simplicity
The second major philosophical foundation is the doctrine of Divine Simplicity. In classical theism, God is not a "composition" of different parts. He does not have a body, nor is He a collection of psychological attributes pieced together.
If God had goodness the way a human "has" a good sense of humor, it would mean goodness is an attribute separate from God's core essence. If that were true, God would be dependent on the attribute of goodness to be good.
Divine Simplicity states that God is His attributes. * God does not have power; He is Power itself.
God does not have existence; He is the Act of Existence itself (Ipsum Esse Subsistens).
God does not have goodness; He is Goodness itself.
Because God has no potentiality—meaning He cannot change, cannot decay, and lacks absolutely nothing—He is the ultimate fullness of Being. And because the fullness of Being is the definition of absolute perfection, God and Goodness are one and the same reality.
3. The Intellectual Lineage: The Thinkers Who Built the Concept
This idea was not invented overnight; it is the result of a brilliant synthesis of Greek philosophy and monotheistic theology.
In The Republic, Plato introduced the concept of the Form of the Good. He used the famous Sun Analogy: just as the sun in the physical world gives light so we can see, and gives energy so things can grow, the "Form of the Good" gives truth to the intellectual world and gives existence to all other forms. For Plato, the Good is the highest, most ultimate reality, existing beyond being itself.
Augustine of Hippo (354–430 AD) — The Theological SynthesisAugustine took Plato's abstract "Form of the Good" and identified it as the personal God of scripture. He famously used this to solve the Problem of Evil. If God created everything, and God is completely good, where did evil come from? Augustine answered that God did not create evil because evil is not a thing. It is merely the turning away of the creaturely will from the Summum Bonum (the Highest Good).
Thomas Aquinas (1225–1274) — The Logical SystematizerAquinas took Aristotle's concepts of potency (potential) and act (actuality) and applied them to God. He argued that everything in the universe is a mix of what it is and what it could be (a seed has the potential to be a tree). God, however, has no unfulfilled potential. He is Pure Act (Actus Purus). Since He is fully actualized, He is the fullness of Being, making Him essentially Goodness itself.
Robert Merrihew Adams (1937–2024) — The Modern Analytic DefenderIn the late 20th century, secular philosophy largely dismissed these medieval concepts as outdated. Adams single-handedly brought them back into analytic prominence with his book Finite and Infinite Goods. He argued that "the Good" is not an abstract concept, but a concrete reality: the nature of God. Human actions are morally excellent to the exact degree that they resemble or faithfully reflect the divine character.
4. Addressing Critical Objections
Objection: "Isn't this just a semantic trick? You're just redefining the word 'God' to mean 'Good' so that God wins the argument by default."
The Response: No, because the argument is based on independent metaphysical deductions. 1) We arrive at the concept of God by looking at the universe and realizing there must be a primary cause that is Pure Actuality and Being itself. 2) We arrive at the concept of Goodness by realizing that perfection means the fullness of being. The philosophy shows that these two separate lines of inquiry collapse into the exact same metaphysical reality.The Response: Classical philosophy distinguishes between metaphysical goodness and experiential or physical evil. A predatory virus has metaphysical goodness (it functions perfectly according to its nature), but its interaction with a human body causes a privation of health in the human. The suffering is real, but it confirms the theory: suffering is always experienced as the loss or corruption of a good thing (health, life, peace), proving that good is the fundamental reality, and evil is a parasite upon it.
The Response: This objection misunderstands the difference between an arbitrary, subjective value judgment and an objective, teleological fact. Goodness is derived from nature and purpose. A knife is, by definition, an instrument manufactured specifically to cut.
Sharpness is not an "outside opinion" we vote on; it is the physical reality required for a knife to successfully actualize its own nature. If a knife cannot cut, it is failing to be what it actually is.The Response: The argument relies entirely on a translation choice in the King James Version (KJV). The Hebrew word used in
This is made clear by the Hebrew poetic parallelism of the verse itself, which pairs opposites: Light is paired with Darkness. Peace ( Shalom / שָׁלוֹם - meaning well-being, prosperity, or wholeness) is paired with Ra'ah (calamity or distress).
God is not saying He authors moral wickedness or sin. Rather, in the context of addressing King Cyrus, He is asserting His total sovereignty over history: both prosperous times and catastrophic judgments come from His hand, shattering the dualistic Persian worldview (Zoroastrianism) that attributed good and calamity to two competing, equal deities.The Response: The objection assumes that "moral good" and "functional good" are two entirely different species of reality that have nothing to do with each other. In classical metaphysics, Goodness is a transcendental property of Being. Goodness simply means the fullness of being according to a thing's nature.
A knife is "good" when it perfectly fulfills its nature (by being sharp and cutting well).
A human being is "good" when they perfectly fulfill human nature.
Therefore, moral goodness is not a magically distinct category of "good"; it is simply functional goodness applied to a rational agent.
The only reason a knife’s goodness isn't "moral" is that a knife lacks a rational soul, intellect, and free will. A knife cannot choose whether to fulfill its purpose.
Humans, however, are rational creatures. Our "function" or purpose, the fulfillment of our nature, includes the proper use of our intellect and will to act in accordance with truth, justice, and reason.
Objection: Let's accept your premises for now. Under them, evil and sin seemingly cease to exist.
Sin and evil are instead tools invented by god, imbued with the same goodness he is. They function somewhat like any other natural law he is said to have shaped: physics, chemistry, biology, take your pick. The formation of viruses and cancer, the level of privation they cause, their existence and impact all intended by god.
So, rather than seeing them as a parasite upon realty, they ought to be interpreted as the good and proper functioning of relatity.
Simply because humans experience them and dislike them doesn't mean god sees it the same way. To god, all the suffer could ultimately (both metaphysically and morally) be good. It's just a human failing or limitation to think otherwise.
The Response: Your argument assumes that under classical theism, sin, and evil are positive substances, "tools invented by God," like gravity, electromagnetism, or a biological law. This is a fundamental misunderstanding of the metaphysics presented.
God creates every substance and mechanism in reality, and those things are inherently good in their being. Evil is not a mechanism; it is a privation. God no more invented evil than a musician invents a sour note, or a physicist creates cold. Cold is simply the absence of heat; a sour note is a deviation from harmony. God sustains the underlying reality, but the defect itself has no independent ontological existence to be shaped or imbued with goodness.
You are also conflating two distinct types of privation: natural evils (like viruses or cancer) and moral evils (sin).
Natural Evils:A virus isn't morally "evil" in itself, it is a biological entity fulfilling its nature, though its interaction with human biology causes a privation of health. Classical theism readily acknowledges that God ordains a physical universe with structural limitations, decay, and physical suffering, which can ultimately serve a greater metaphysical purpose (such as soul-making or maintaining a consistent ecosystem).
Moral Evils (Sin): Sin is entirely different. It is a defect in the rational will turning away from God who does not "intend" or "use" the sin itself as a design feature; rather, He permits the possibility of the defect because granting true creaturely freedom possesses a higher ontological value than creating a universe of forced, robotic perfection.
The Response: The objection claims that because an animal's natural drives can lead to forced reproduction or violence, fulfilling its "nature" means rape or harm must be considered "good" under your framework. This completely conflates a material biological impulse with an ontological final cause (purpose).
1) In classical metaphysics, a creature's purpose is not defined by whatever base, physical survival behaviors manifest within a fallen, resource-scarce ecosystem. An animal's true flourishing includes its proper relation to its environment, the preservation of its species, and structural harmony. Physical violence or predation in nature represents the inherent structural limitations and physical privations of a material, changing universe, not the absolute definition of metaphysical excellence.
2) The critique argues that a sociopath has a different "intended nature or purpose" than a philanthropist, implying that purpose is entirely subjective or relative. This is a severe metaphysical error.
A sociopath does not possess an alternative, equally valid human nature; they possess a damaged human nature. Sociopathy is a psychological and neurological defect, a literal privation of the empathy, rationality, and relational capacities that naturally belong to a fully functioning human being. To claim a sociopath is successfully fulfilling an alternate "purpose" is like claiming a kitchen clock that runs backward is successfully fulfilling an alternate "purpose" compared to a working clock. It mistakes a structural malfunction for an intentional design.
3) The objection asks whether a kitchen knife isn't "good" until it has cut every single item it will ever cut in its lifetime, confusing teleological design with chronological exhaustion.
A knife is good simpliciter if it possesses the structural capacity and actualized features (sharpness, balance, integrity) to fulfill its function perfectly right now. It does not need to exhaust every potential future action to be a complete reflection of a knife. God, being Pure Actuality, has no future potentiality to fulfill, lacks absolutely nothing, and stands entirely outside of time, meaning He possesses the ultimate "fullness of being" statically, completely, and eternally.
4) Finally, the objection claims that defining evil as privation fails because "people associate evil with causing harm."But what is "harm"? Harm is quite literally the destruction, loss, or corruption of a positive good (e.g., harming a body is depriving it of health; harming a mind is depriving it of peace). You cannot define harm or a reduction of harm without implicitly assuming a baseline of wholeness and well-being that ought to be there. By reducing evil to something that causes harm, you've inadvertently proven the classical theistic point: Good is the primary, substantial reality, and evil is merely its distortion.
Objection: To understand Goodness as "Fullness of Being", we must define "good" the way the philosophers: a thing is good to the extent that it successfully actualizes its intended nature or purpose.' So, god says its good because it adheres to this criteria right? The entire question is 'what is it that makes us consider something to be good?', and here we have our answer with no gods in sight. We consider a thing good when it does what we want it to do.
This is a massive slide from objective teleology to subjective utilitarianism. When classical philosophy defines a "good knife" by its sharpness, it is not saying the knife is good because it satisfies a human whim. It is saying the knife is good because it possesses the objective, structural excellence necessary to fulfill its intrinsic nature as a cutting tool.
If a human decides to use a beautifully sharp, structurally perfect knife as a screwdriver and breaks it, the knife hasn't suddenly become "metaphysically bad." The human is simply misusing a fundamentally good object. Goodness is grounded in the ontological integrity of the object itself, not the arbitrary desires of the observer.
2) If we accept your definition, that goodness is entirely dependent on "what we want it to do", then the very concept of objective morality instantly evaporates.
If a society "wants" a totalitarian system to suppress a minority group, and that system functions seamlessly to achieve that goal, you would be forced to call that system "good" because it is doing what they want it to do.
By stripping away the concept of an objective, intrinsic nature designed by an ultimate reality, you collapse all of ethics into pure power dynamics and relative preferences. The classical definition prevents this collapse by insisting that a things' nature is an objective fact, not a social construct.
3) You ask, "What is it that makes us consider something to be good?" and claim the answer requires no god. But you are missing the foundational question: Why do things have an intrinsic, intelligible nature to begin with?
A knife has an intended purpose because a human mind designed it with a final cause in view. But what about human beings? What about the universe itself? If there is no supreme Intellect (God) to anchor the design blueprint of human nature, then human beings have a) no intrinsic purpose, b) no objective standard of flourishing, and c) no basis for genuine moral obligations.
By trying to smuggle the word "purpose" into a purely secular, godless universe, you are using the currency of theism while denying the bank that backs it. Without God as the ultimate source of Being and blueprint, "purpose" is just an illusion, and your definition of good falls apart into pure arbitrariness.
Objection: The trouble comes in when you get into the weeds here. So suppose god said theft is good. Well then it would be good, because god is perfectly good, and it is his moral view that theft is good. So that's the first horn.If you try to resolve this by saying "god couldn't hold the view that theft is good because _____", well now you are limiting god using reasoning. That reasoning provided is the external thing above god. That's the second horn.
The Response: The core flaw in this objection is treating logical impossibilities (like a "married bachelor," a "four-sided triangle," or "theft being absolute goodness") as if they are actual things or actions that God is being restricted from doing.
In classical metaphysics, a contradiction is not a thing; it is non-being. It is pure nonsense. To say "God cannot make a square circle" is not to say God lacks power; it is to say that a square circle is literally nothing.
God's omnipotence means He can actualize any possible reality. It does not mean He can actualize absolute nothingness or logical absurdities. Therefore, stating that God cannot hold a view that contradicts His own nature is not an external limitation; it is a description of His absolute, uncompromised perfection.
2) The objection claims that if we use reasoning to show why God cannot declare theft to be good, then that "reasoning provided is the external thing above god." This completely misunderstands the pillar of Divine Simplicity explained in the original post.
We are not holding God accountable to an independent, cosmic textbook of logic floating out in space. Logic and truth are not external standards that God must consult; logic is the human description of the internal consistency of God's own mind and being.
God does not "obey" the law of non-contradiction. Rather, the law of non-contradiction exists because God is perfectly consistent, unchanging, and true to His own nature.
When we use reason to analyze God, we aren't placing reason above Him; we are using a tool (which He gifted to rational creatures) to map out the foundational architecture of reality that He sustains.3) If God could simply wake up tomorrow and declare theft, murder, or betrayal to be "absolute goodness," then goodness is reduced to a contentless word. It becomes pure, raw power and totalitarian whim, the exact trap of the first horn of the dilemma.
By grounding goodness and logic perfectly inside the immutable, unified nature of God, classical theism successfully completely bypasses both horns of the Euthyphro dilemma. God cannot declare theft to be good because theft is a privation (a stealing of a good that belongs to another), and the Fullness of Being cannot be, or desire, a lack of being. It has nothing to do with external rules; it has everything to do with God being entirely whole.
You are treating logical consistency as if it were a traffic law God is forced to obey. But under Divine Simplicity, logic isn't a rule above God, it is an expression of who God is. God cannot make theft 'good' for the same reason He cannot make a square circle: because contradictions are non-being, and the Fullness of Being cannot produce nothingness. Pointing out that God cannot contradict Himself doesn't limit His power; it affirms His absolute perfection."
Objection: Divine Simplicity is heavily dependent on Greek philosophy's definitions of terms and reasoning built on those definitions, later syncretized into Christianity. In God we trust--all others please bring data.
By simply assuming Divine Simplicity, your argument introduces a logical impossibility: that a term defined as a state achievable by any entity, is also the definition of a single entity independent of other entities. State of any entity = a single independent entity is a logical contradiction of terms.
In plainer terms--If "God is goodness," and goodness is "the extent that [a free will entity] successfully aligns with ultimate truth and the design of reality," then by your own definition, any free will entity that has fully actualized in this way is God. If I fully actualize my alignment with ultimate truth and design of reality, I become God, by definition. Except you also define God as independent of any created entity, so I cannot be God.
1. The Philosophical Foundations
Two major metaphysical doctrines allow philosophers to equate God with Goodness:
The Convertibility of the Transcendentals: In medieval philosophy, reality has ultimate properties called "transcendentals", chiefly Being (Existence), Truth, and Goodness. Philosophers argued that these are fundamentally the same thing viewed from different angles. To have being is to have a degree of goodness. Because God is supreme, unlimited Being, He is identical to supreme, unlimited Goodness.
Divine Simplicity: This is the classical framework stating that God has no parts, attributes, or accidental properties. God doesn't have goodness the way a human "has" a good day or a good character. If God had goodness as a separate trait, He would be dependent on that trait. Therefore, God is His attributes. God is Justice; God is Love; God is Goodness.
2. The Key Philosophers
The journey toward this idea bridges ancient Greek metaphysics and medieval theology.
Plato (428–348 BC)While not a Christian theist, Plato laid the absolute groundwork in his Republic. He argued for the existence of the Form of the Good—the ultimate, self-existing reality from which everything else gets its truth and existence. Early Christian thinkers looked at Plato's "Form of the Good" and realized it perfectly described the nature of the true God.
Augustine of Hippo (354–430 AD)Augustine took Plato's concepts and baptized them into Christian theology. He argued that God is the Summum Bonum (the Highest Good). For Augustine, everything created is good because it was made by God, but things can lose their goodness (which is how he defined evil: a privation or "lack" of goodness, rather than a thing itself). God, being immutable, is goodness itself.
Thomas Aquinas (1225–1274)Aquinas formalized this explicitly in his Summa Theologiae. Using Aristotelian logic, he argued that "goodness" and "being" are really the same thing. Because God is Ipsum Esse Subsistens (Subsistent Act of Existing Itself), and the fullness of being is the fullness of perfection, God is essentially Goodness itself.
Robert Merrihew Adams (1937–2024)Bringing this into contemporary analytic philosophy, Adams developed a modern framework known as Modified Divine Command Theory. He argued that the standard of excellence is not an abstract rule, but a concrete person: God. Goodness is identical to being like God.
3. Recommended Books to Expand on This
If you want to dig into the mechanics of how this works, these texts bridge the gap between historical foundation and modern philosophical defense:
On the Free Choice of the Will — Augustine
Why read it: It is one of the foundational texts explaining the relationship between God, the human will, and the nature of the Good. It’s highly readable and shows Augustine wrestling directly with where goodness comes from and how evil is simply a turning away from that ultimate Good.
Aquinas (A Beginner's Guide) — Edward Feser
Why read it: Reading Aquinas raw can be incredibly dense. Feser provides an exceptionally clear, modern defense of Thomistic metaphysics. He spends significant time breaking down Divine Simplicity and why classical theism views God not as a "super-being" among other beings, but as Being and Goodness itself.
Finite and Infinite Goods: A Framework for Ethics — Robert Merrihew Adams
Why read it: This is a modern masterwork in philosophy of religion. Adams explicitly defends the view that the Good is identical to God. It is an analytical, rigorous look at how we can anchor objective moral values in a divine nature without falling into logical traps.
Good God: The Theistic Foundations of Morality — David Baggett and Jerry L. Walls
Why read it: This is an excellent, highly accessible contemporary book that directly addresses the "Euthyphro Dilemma" (the question of whether God creates or follows goodness). It argues passionately that a robust defense of objective morality naturally points to a God who is essentially good.
Would you like to explore how this concept answers the Euthyphro Dilemma specifically, or focus on a particular historical era?
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