Anselm on God

Quote

"That than which nothing greater can be conceived."

— Anselm of Canterbury, Proslogion (Chapter 2, c. 1078)

In the original Latin: id quo nihil maius cogitari possit. This single phrase is the seed from which the ontological argument — one of the most famous, controversial, and enduring arguments in the history of philosophy — grows. Anselm offers it not as a proof that God exists but as a definition of God, from which he then attempts to derive existence by reason alone.

Historical Context

Anselm wrote the Proslogion around 1077-78, while he was abbot of the Benedictine monastery of Bec in Normandy, before his elevation to the Archbishopric of Canterbury. The work's original title was Fides quaerens intellectum — "Faith Seeking Understanding" — and it is written as a prayer, addressed directly to God. Anselm composed it after his earlier work, the Monologion, which had offered several arguments for God's existence based on degrees of perfection and the order of the world. Dissatisfied with the Monologion's multiplicity and complexity, Anselm sought what he called a unum argumentum — a single argument that would prove not only God's existence but all of God's attributes from one starting point. The phrase "that than which nothing greater can be conceived" is that starting point.

The intellectual world in which Anselm wrote was the early scholastic period, when European thinkers were beginning to revive the tools of logic and dialectic that would define medieval philosophy. Anselm's approach was distinctive: he proceeded without direct appeal to scriptural authority, reasoning as though the mind had only its own resources, even though the whole enterprise was framed by faith and prayer. This a priori character — the attempt to establish the existence of God from the concept of God alone, without any appeal to empirical observation — is what makes the argument genuinely philosophical and what has kept it alive for nearly a thousand years. The argument immediately attracted criticism: a monk named Gaunilo, writing around 1078, objected that one could use the same reasoning to prove the existence of a perfect island. Anselm replied, and the exchange was preserved alongside the Proslogion itself. The argument was later rejected by Aquinas, revived by Descartes, critiqued by Kant, and reformulated in modal logic in the twentieth century.

Philosophical Interpretation

The phrase "that than which nothing greater can be conceived" is a definition, and Anselm's genius lies in the reasoning he builds upon it. In Chapter 2 of the Proslogion, he argues as follows. Even the fool who says in his heart "there is no God" (Psalm 14:1) understands this definition when it is heard. Whatever is understood exists in the understanding, even if it does not exist in reality. Now, that than which nothing greater can be conceived cannot exist in the understanding alone, because if it existed only in the understanding, then one could conceive of something greater — namely, the same thing existing in reality as well. Therefore, that than which nothing greater can be conceived must exist both in the understanding and in reality. The argument moves from a concept in the mind to the existence of a being in reality, and it does so by appealing to the logic of "greater than": existence in reality is greater than existence in the understanding alone, so the greatest conceivable being cannot lack real existence.

The argument's audacity is its refusal to depend on any empirical premise. Unlike cosmological arguments, which infer a first cause from the existence of the world, or teleological arguments, which infer a designer from the order of nature, the ontological argument claims to establish God's existence from the concept of God alone, by pure reasoning. This is why it has fascinated philosophers of every persuasion. Those who reject it must explain where the reasoning goes wrong — and the history of such critiques is itself a major chapter in the philosophy of religion. Gaunilo's perfect island objection asks whether the logic works for any "perfect" thing; Aquinas argued that the argument illegitimately moves from a concept in our minds to existence in reality, since we cannot know God's essence well enough to read existence from it; Kant delivered what many took to be the decisive blow by arguing that "existence" is not a real predicate — that is, saying that something exists does not add to its concept but only asserts that the concept is instantiated.

Yet the argument has refused to die. In the seventeenth century, Descartes reformulated it around the idea of a supremely perfect being, arguing that existence is a perfection and must therefore belong to a supremely perfect being as necessarily as having three angles belongs to a triangle. In the twentieth century, modal versions of the argument, developed by Charles Hartshorne, Norman Malcolm, and Alvin Plantinga, recast the reasoning in terms of possible worlds: if a maximally great being exists in any possible world, it exists in all possible worlds, including the actual one. Whether these modal versions succeed is still debated, but their existence testifies to the argument's enduring power. The phrase "that than which nothing greater can be conceived" continues to generate serious philosophical engagement because it poses a question that the tradition cannot let go: can the concept of a perfect being, by itself, guarantee that such a being exists?

Related Concepts

The ontological argument connects to several broader philosophical themes. The most immediate is the relationship between faith and reason. Anselm's method of faith seeking understanding (fides quaerens intellectum) does not use reason to arrive at faith but uses reason to deepen a faith that is already held. The argument is offered not to convert the unbeliever but to satisfy the believer's desire to understand what is believed — though, paradoxically, it has been taken up by philosophers precisely as a rational proof aimed at any rational inquirer. This tension between the devotional and the philosophical contexts is part of what makes the argument so rich.

The argument also raises fundamental questions about existence as a property. Is "exists" a predicate that can be included in a concept, as Anselm and Descartes assume, or is it a logical quantifier that asserts instantiation, as Kant and Frege argue? This question reaches into the foundations of logic and the philosophy of language. It also touches on the concept of perfection: the argument presupposes a hierarchy of being in which some things are "greater" than others, a Neoplatonic assumption that Anselm inherits from Augustine. Whether such a hierarchy is coherent, and whether existence is the summit of it, remains contested. Finally, the argument belongs to the philosophy of religion, where it stands alongside cosmological, teleological, and moral arguments as one of the classical "proofs" of God's existence — though its a priori character makes it unique among them.

Learning Path

To deepen your understanding of Anselm's ontological argument, consider the following path:

1. Start with the thinker: Read the full Anselm of Canterbury page to understand his biography, his method of faith seeking understanding, and the satisfaction theory of atonement alongside the ontological argument.
2. Explore the philosophical tradition: The argument belongs to the philosophy of religion, where it is one of the classical proofs. Understanding how it differs from cosmological and teleological arguments clarifies what is distinctive about its a priori approach.
3. Follow the argument's afterlife: Trace the argument through Descartes (who reformulated it around a supremely perfect being), Kant (who argued that existence is not a predicate), and the twentieth-century modal versions. Each stage refines or challenges the original reasoning.
4. Connect to faith and knowledge: Anselm's method raises deep questions about the relationship between faith and knowledge. Explore how his formula fides quaerens intellectum shapes the whole enterprise of scholastic theology.
5. Read the primary source: The Proslogion, especially Chapters 2-4, is short and powerful. M. J. Charlesworth's edition (University of Notre Dame Press, 1979) includes the Latin text, an English translation, and Anselm's exchange with Gaunilo.

Sources

1. Stanford Encyclopedia of Philosophy, "Saint Anselm." Covers the ontological argument in detail, the exchange with Gaunilo, the method of faith seeking understanding, and the argument's reception from Aquinas to modern modal logic.
2. Anselm of Canterbury, Proslogion, trans. M. J. Charlesworth (University of Notre Dame Press, 1979). A critical edition with the Latin text and English translation, plus Gaunilo's objection and Anselm's reply.