# Anselm Archbishop of Canterbury (1093-1109); Italian-born Benedictine monk and theologian; AD 1033-1109. Originator of the **ontological argument** for God's existence and the **satisfaction theory** of atonement. The bridge between Augustinian-Platonist patristic thought and the Aristotelian-Thomist scholasticism that followed. ## Biography - **1033**, Born at Aosta in northern Italy - **1059**, Joined the Benedictine abbey of Bec in Normandy under Lanfranc - **1063**, Prior of Bec - **1078**, Abbot of Bec - **1093**, Archbishop of Canterbury (succeeding Lanfranc) - **1097-1100**, Exile (dispute with William II) - **1103-1107**, Second exile (dispute with Henry I over investiture) - **1109**, Died at Canterbury ## Major works ### *Monologion* (1076) A meditation on the divine essence, what reason alone can establish about God. Anselm seeks to show the existence and attributes of God *sola ratione* (by reason alone), without appeal to scripture for the foundational moves. A 79-chapter treatise. ### *Proslogion* (1077-1078) The work containing the **ontological argument** (chs. 2-3). The famous formulation: > We believe You to be that than which a greater cannot be thought (*aliquid quo nihil maius cogitari possit*). The argument: if God is the greatest conceivable being, He must exist necessarily, since necessary existence is greater than contingent existence. See [Modal Ontological Argument](/codex/modal-ontological-argument/) and [Perfection Argument](/codex/perfection-argument/) for the full treatment. The *Proslogion* opens with the Augustinian formulation: *fides quaerens intellectum*, "faith seeking understanding." This phrase becomes the methodological motto of medieval scholasticism. ### *Cur Deus Homo* (1098) "Why God Became Man", Anselm's foundational work on **atonement theology**. Develops the **satisfaction theory**: humans owe an infinite debt of honor to God because of sin; this debt cannot be paid by any finite creature; only one who is both human (to owe the debt) and divine (to pay infinite satisfaction) can satisfy. Hence the necessity of the God-man (Christ). This theory: - Decisively rejected the *ransom-to-Satan* model (Origen, Gregory of Nyssa) that had dominated patristic atonement theology - Anticipated and prepared for the Reformed *penal substitution* doctrine (Calvin) - Remains foundational in Catholic and Protestant atonement theology ### Other works - *De Veritate*, on truth - *De Libertate Arbitrii*, on free will - *De Casu Diaboli*, on the fall of Satan - *De Conceptu Virginali et de Originali Peccato*, on the virgin conception and original sin - *De Processione Spiritus Sancti*, on the procession of the Holy Spirit (Filioque) - *De Concordia* (in full: *On the Harmony of the Foreknowledge and the Predestination and the Grace of God with Free Will*), his last completed philosophical work; contains the clearest statement of his four-dimensionalist doctrine of eternity (1.5) alongside his account of grace and libertarian freedom ## Major contributions ### 1. The ontological argument Anselm's *Proslogion* 2-3 contains the foundational ontological argument: 1. God is *that than which nothing greater can be thought* (definition) 2. Even the fool understands this concept 3. What exists *both in understanding and in reality* is greater than what exists *in understanding alone* 4. Therefore, God must exist in reality, otherwise He would not be the greatest conceivable The argument has been: - Refuted by Gaunilo's "perfect island" objection (11th c.), Anselm replied that islands have no intrinsic maximum, but God does - Refuted (allegedly) by Kant's claim that *existence is not a predicate* (1781) - Defended in modal-logic form by Norman Malcolm (1960) and [Alvin Plantinga](/codex/alvin-plantinga/) (1974), see [Modal Ontological Argument](/codex/modal-ontological-argument/) The argument remains contested but has had distinguished defenders for nearly 1,000 years. ### 2. Satisfaction theory of atonement *Cur Deus Homo* presents the satisfaction theory as a response to Boso's question: *why did God become man?* The argument: - Sin against an infinite God incurs infinite debt - No mere creature can pay infinite debt - God could simply forgive, but this would compromise divine justice - Only a God-man can both *owe* the debt (as human) and *pay* it (as divine) - Therefore, the incarnation is *necessary* for redemption Anselm's framework has been: - Adopted (with refinement toward penal-substitution) by the Reformed tradition (Calvin *Institutes* II.16-17; Westminster Confession 8) - Critiqued as overly transactional / juridical by liberal theology - Defended by modern Reformed scholarship (J. I. Packer, John Stott, Steve Jeffery et al. *Pierced for Our Transgressions* 2007) ### 3. Faith seeking understanding The methodological motto *fides quaerens intellectum* shaped medieval theological method: faith provides the starting-point; reason explores and articulates faith's content. This is *not* fideism (faith against reason) nor rationalism (reason without faith) but a careful integration. Anselm thereby anticipated medieval scholasticism. ### 4. Divine eternity and four-dimensional time Anselm developed Boethius's eternal-now into what Katherin Rogers has called the first clear four-dimensionalist theory of time in the history of philosophy. Treating time in strict parallel with space (Monologion 20-24; Proslogion 19-20; De Concordia 1.5), Anselm argues that God is outside time as He is outside space, that all times exist equally because God is causally present to every one of them, and that "past," "present," and "future" are perceiver-relative terms like "here" and "there." His summary formula: "eternity has its own unique simultaneity in which exist all the things that exist at any place or time" (De Concordia 1.5). Where Boethius said God sees all times *as though* present, Anselm drops the hedge: the things themselves are present to divine eternity. The doctrine does double apologetic duty. It answers the objection that a timeless God could not know what time it is now (no moment is ontologically privileged, so there is no missing fact), and, paired with Anselm's libertarian account of freedom (De Concordia; De Libertate Arbitrii), it dissolves the freedom-and-foreknowledge dilemma: God knows free choices by seeing them present in eternity, so the choice is the source of His knowledge rather than its effect. Full debate-prep treatment at [Anselms Four-Dimensionalist Eternity](/codex/anselms-four-dimensionalist-eternity/); doctrinal background at [Eternity (Divine)](/codex/eternity-divine/). ## Anselm in the apologetic tradition Anselm is referenced in: - [Modal Ontological Argument](/codex/modal-ontological-argument/), primary developer - [Perfection Argument](/codex/perfection-argument/), primary developer - [Christology](/codex/christianity/), *Cur Deus Homo* satisfaction theory - [Hell and Eternal Punishment](/codex/hell-and-eternal-punishment/), Anselm's "infinite debt for sin against infinite God" addresses proportionality objection - [G2434 - hilasmos](/codex/g2434-hilasmos/), [G2435 - hilasterion](/codex/g2435-hilasterion/), atonement-theory background ## Reception history ### Medieval Anselm's ontological argument was largely set aside by Aquinas in favor of *a posteriori* arguments (Five Ways). Anselm's satisfaction theory of atonement was adopted and refined by Aquinas (*Summa* III, q. 46-49). ### Reformation The Reformation appealed to Anselm's atonement theology in transitioning toward penal substitution. ### Modern Anselm's ontological argument has been revived in: - Charles Hartshorne (*The Logic of Perfection*, 1962) - Norman Malcolm (1960) - [Alvin Plantinga](/codex/alvin-plantinga/) (*The Nature of Necessity*, 1974; *God, Freedom, and Evil*, 1974), modal-logic version - Robert M. Adams (1971), analyzing the original argument ## Major secondary literature - R. W. Southern, *Saint Anselm: A Portrait in a Landscape* (1990) - G. R. Evans, *Anselm and Talking About God* (1978) - Brian Davies, *The Thought of Anselm of Canterbury* (Cambridge Companion, 2004) - Eleonore Stump, *Aquinas* (2003), comparative engagement - Sandra Visser & Thomas Williams, *Anselm* (2009) - Katherin A. Rogers, "Anselm on Eternity as the Fifth Dimension" (Saint Anselm Journal 3.2, 2006); *The Neoplatonic Metaphysics and Epistemology of Anselm of Canterbury* (1997); *Anselm on Freedom* (2008) ## Connection to codex concepts (added 2026-04-28 bulk extraction) The 2026-04-28 ยง5.4 extraction built 99 new concept hubs that name Anselm as the foundational developer of the satisfaction-theory and ontological argument: - [Penal Substitutionary Atonement](/codex/penal-substitutionary-atonement/), *Cur Deus Homo* (1098) gives the foundational satisfaction-theory; Christ's voluntary death has infinite worth and so satisfies the infinite debt of human sin against God's honor; the Reformers reframe Anselm's *honor*-frame to a *justice / law*-frame - [Justification by Faith](/codex/justification-by-faith/), *Cur Deus Homo* (c. 1098) frames the cross as satisfaction of divine honor, proto-substitutionary structure that the Reformers re-cast in legal terms - [Biblical Forgiveness](/codex/biblical-forgiveness/), *Cur Deus Homo* (1098); the satisfaction theory of atonement that grounds forgiveness in Christ's payment of the debt - [Necessary vs Contingent Being](/codex/necessary-vs-contingent-being/), *Proslogion* (1078) treats God as a being whose non-existence is impossible; "central plank of Christian metaphysics from Augustine through Anselm, Aquinas..." - [Principle of Sufficient Reason](/codex/principle-of-sufficient-reason/), Anselm and Aquinas hold an implicit PSR in cosmological arguments, though not formally stated as a general principle - [Theories of Truth](/codex/theories-of-truth/), *De Veritate* cited as part of the classical Christian correspondence-theory development (alongside Aquinas, Augustine) - [Rationalism](/codex/rationalism/), *Proslogion* (1078); the *fides quaerens intellectum* project; the ontological argument as paradigm rationalist proof - [Critical Thinking Christian Framework](/codex/critical-thinking-christian-framework/), *Proslogion*; *fides quaerens intellectum* as foundational Christian-philosophical commitment - [Mary Sinless](/codex/mary-sinless/), Anselm (with Bernard of Clairvaux) was a notable medieval *opponent* of the Immaculate Conception, holding it incompatible with Mary's need for a Savior ## See also - [Augustine](/codex/augustine/), *fides quaerens intellectum* heritage - [Plato](/codex/plato/), Platonist tendencies in the ontological argument - [Thomas Aquinas](/codex/thomas-aquinas/), Aristotelian-scholastic successor - [Boethius](/codex/boethius/), predecessor on divine eternity - [Modal Ontological Argument](/codex/modal-ontological-argument/) - [Perfection Argument](/codex/perfection-argument/) - [Anselms Four-Dimensionalist Eternity](/codex/anselms-four-dimensionalist-eternity/), his doctrine of God and time in debate-prep shape - [Eternity (Divine)](/codex/eternity-divine/), the doctrine his four-dimensionalism defends - [Christology](/codex/christianity/), Anselmian satisfaction theology - [Hell and Eternal Punishment](/codex/hell-and-eternal-punishment/), proportionality framework - Hubs Roadmap