# Bonaventure Italian Franciscan friar, theologian, and philosopher; Minister General of the Franciscan Order (1257-1274); declared Doctor of the Church in 1588 (the *Seraphic Doctor*). A near-exact contemporary of [Thomas Aquinas](/codex/thomas-aquinas/) at the University of Paris, Bonaventure represents the **Augustinian-Platonist** wing of high scholasticism, emphasizing illumination, divine exemplarity, the affective ascent of the mind to God, and a *via mystica* over the Aristotelian-empirical *via demonstrativa* favored by the Dominicans. His major doctrinal works (*Commentary on the Sentences*, c. 1250-52; the *Breviloquium*, 1257; the *Itinerarium Mentis in Deum*, 1259) became the standard Franciscan textbook tradition. ## Position in the codex's framework Bonaventure is a **medieval voice for the necessity of a temporal beginning of the universe**, distinguishing him sharply from Aquinas, who held that an eternal-yet-created universe is *philosophically possible* (though we know by revelation that creation is temporal). The Bonaventure-Aquinas disagreement is one of the most cited cases in medieval cosmological theology and connects directly to the contemporary [Kalam Cosmological Argument](/codex/kalam-cosmological-argument/): - **Bonaventure** (*Commentary on II Sentences*, d. 1, p. 1, a. 1, q. 2): argues that the universe *cannot* be eternal even in principle, an infinite past would require an actually-infinite-completed set of past durations (he prefigures the modern impossibility-of-actual-infinite-past argument); past durations can be counted from the present backward; one cannot add to an actual infinite; etc. Several of his arguments are direct ancestors of William Lane Craig's *kalam* revival. - **Aquinas** (*ST* I q. 46 a. 2): argues that an eternal created universe is philosophically *possible* (a universe could be eternally dependent on God); we know creation is temporal *only* by revelation. The disagreement is not over whether creation happened, both affirm it, but over whether philosophical reason alone can prove it. The Bonaventure side is the historic source of the strong *philosophical* case for a beginning, which contemporary *kalam* defenders revive against eternal-universe and oscillating-universe cosmologies. See [Kalam Cosmological Argument](/codex/kalam-cosmological-argument/). ## Other relevant positions - **Hexaemeral exegesis**: Bonaventure's *Collations on the Six Days* (*Collationes in Hexaemeron*, 1273) is a sustained mystical reading of [Genesis 1](/codex/genesis-1/) as the structure of all reality, neither strict 24-hour creationism nor full Augustinian instantaneous-creation, but an exemplarist Christology in which the six days unfold the divine Word's reflection in creation. See [Genesis Interpretation Spread](/codex/genesis-interpretation-spread/) ยง patristic context, Bonaventure is one of the medieval witnesses to non-uniform reading of [Genesis 1](/codex/genesis-1/). - **Divine exemplarity**: every created being mirrors a *ratio aeterna* (eternal idea) in the divine mind; the cosmos is theophanic, every creature a "footprint" (*vestigium*) or "image" (*imago*) of God. The framework grounds his sacramental ontology and shapes much of medieval Franciscan natural theology. - **Mystical ascent**: the *Itinerarium Mentis in Deum* lays out a six-stage ascent through created reality, the soul, and divine names into mystical union, one of the foundational texts of Western contemplative theology. ## Major works - *Commentary on the Sentences of Peter Lombard* (c. 1250-52), academic systematic theology - *Breviloquium* (1257), compact summa of Franciscan theology - *Itinerarium Mentis in Deum* (1259), six-stage mystical ascent - *Legenda Maior* (1263), official biography of Francis of Assisi - *Collationes in Hexaemeron* (1273), unfinished lectures on [Genesis 1](/codex/genesis-1/) / cosmic exemplarity - *Quaestiones Disputatae de Mysterio Trinitatis* ## Reception - Made Doctor of the Church (1588); patron of the Franciscan order; cited by Catholic encyclical tradition through Leo XIII's *Aeterni Patris* (1879). - The Augustinian-Platonist wing he represents was eclipsed in Catholic theology by the 19th-century Thomistic revival but never disappeared; recent retrievals (Joseph Ratzinger / Benedict XVI's habilitation thesis was on Bonaventure's theology of history; Jean-Luc Marion, Hans Urs von Balthasar) have re-centered his thought. - His cosmological-temporal-beginning argument was largely forgotten until William Lane Craig's *The Kalam Cosmological Argument* (1979) revived it; Craig credits Bonaventure as a direct medieval precursor. ## See also - [Thomas Aquinas](/codex/thomas-aquinas/), near-contemporary at Paris; disagrees on the *philosophical* (not theological) possibility of an eternal universe - [Kalam Cosmological Argument](/codex/kalam-cosmological-argument/), Bonaventure as medieval source - [Genesis Interpretation Spread](/codex/genesis-interpretation-spread/), Bonaventure as a witness to non-uniform medieval reading of [Genesis 1](/codex/genesis-1/) - [Augustine](/codex/augustine/), Bonaventure's principal patristic source - [Anselm](/codex/anselm/), Augustinian-Platonist analogue, earlier scholastic - *Francis of Assisi*, Bonaventure as biographer and Franciscan leader