Gregory of Nyssa wrote this treatise shortly after the death of his brother Basil the Great in 379, in response to questions and objections that had arisen about Basil's own famous homilies on the six days of creation, the Hexaemeron. Addressed to their brother Peter, bishop of Sebaste, the work defends Basil against charges that his account of the cosmos was inconsistent or scientifically naive, while also carrying the inquiry further than Basil had taken it.
Gregory's defense is not merely apologetic. He takes up the hard points in Genesis one by one — the nature of the firmament, the waters above and below it, the ordering of light before the sun, the relation of the six days to physical time — and works them through using the natural philosophy and cosmology available to him, chiefly Greek physics and the Platonic tradition filtered through Origen. His most consequential move is to argue that God created all things simultaneously, in a single act, with the created order possessing from the first moment a seed-like potency (dynamis) that unfolds into the distinct forms and days described in the biblical narrative. The six days thus become a way of narrating, in sequence suited to human understanding, what occurred in reality all at once. This lets Gregory harmonize Mosaic cosmogony with contemporary science without surrendering the authority of the text, treating Genesis as true in its theological intent even where its narrative order is didactic rather than literal-temporal.
The treatise matters for several intertwined reasons. It is a primary document in the fourth-century Christian effort to hold scripture and Hellenistic natural philosophy together without collapsing one into the other, and its doctrine of simultaneous creation with unfolding potency had a long afterlife, feeding into Augustine's own treatment of the days of creation in his later commentaries on Genesis. It is also a window into how the Cappadocian family read, defended, and revised one another's work, since Gregory treats Basil's homilies as authoritative yet open to development rather than as a closed text.
Who should read this: students of patristic exegesis and of the historical dialogue between theology and natural science, and readers working through Basil's Hexaemeron who want to see how a careful fourth-century mind handled its difficulties. It is not devotional reading, and it assumes patience with ancient physics and philosophical vocabulary; readers wanting a straightforward spiritual or pastoral text should look elsewhere in Gregory's corpus.
On the Six Days of Creation
by Gregory of Nyssa
For For readers of Basil's Hexaemeron who want its sequel: Gregory's defence of his brother's six days and his own account of creation as a single act unfolding in order; for students more than general readers.
Length About 13,800 words, about an hour.
Should I read this?
Written for his brother Peter in 379 to defend Basil's Hexaemeron and finish its thought: creation was one instantaneous act whose contents then appeared in sequence by their own natures. Dense natural philosophy; the companion of On the Making of Man.
How it proceeds
Independent intensities, 0–5 — what the work is made of, not how good it is.
Gregory of Nyssa wrote this treatise shortly after the death of his brother Basil the Great in 379, in response to questions and objections that had arisen about Basil's own famous homilies on the six days of creation, the Hexaemeron. Addressed to their brother Peter, bishop of Sebaste, the work defends Basil against charges that his account of the cosmos was inconsistent or scientifically naive, while also carrying the inquiry further than Basil had taken it.
Gregory's defense is not merely apologetic. He takes up the hard points in Genesis one by one — the nature of the firmament, the waters above and below it, the ordering of light before the sun, the relation of the six days to physical time — and works them through using the natural philosophy and cosmology available to him, chiefly Greek physics and the Platonic tradition filtered through Origen. His most consequential move is to argue that God created all things simultaneously, in a single act, with the created order possessing from the first moment a seed-like potency (dynamis) that unfolds into the distinct forms and days described in the biblical narrative. The six days thus become a way of narrating, in sequence suited to human understanding, what occurred in reality all at once. This lets Gregory harmonize Mosaic cosmogony with contemporary science without surrendering the authority of the text, treating Genesis as true in its theological intent even where its narrative order is didactic rather than literal-temporal.
The treatise matters for several intertwined reasons. It is a primary document in the fourth-century Christian effort to hold scripture and Hellenistic natural philosophy together without collapsing one into the other, and its doctrine of simultaneous creation with unfolding potency had a long afterlife, feeding into Augustine's own treatment of the days of creation in his later commentaries on Genesis. It is also a window into how the Cappadocian family read, defended, and revised one another's work, since Gregory treats Basil's homilies as authoritative yet open to development rather than as a closed text.
Who should read this: students of patristic exegesis and of the historical dialogue between theology and natural science, and readers working through Basil's Hexaemeron who want to see how a careful fourth-century mind handled its difficulties. It is not devotional reading, and it assumes patience with ancient physics and philosophical vocabulary; readers wanting a straightforward spiritual or pastoral text should look elsewhere in Gregory's corpus.
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