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Wellsprings
cosmology

Generation & Corruption

γένεσις καὶ φθορά

Aristotle's account, in On Generation and Corruption, of how substances come to be and pass away — as against mere alteration.

Aristotle systematized the problem of change by distinguishing generation (coming-to-be) from corruption (passing-away), arguing that neither happens from absolute nothingness as the early Presocratics had worried. Instead, change occurs when matter takes on or loses a form while retaining its underlying substrate. This framework resolved the paradox that genuine change seemed impossible if things either fully exist or fully do not exist. Aristotle insisted that generation and corruption are real phenomena, not mere illusions or rearrangements of eternal atoms, making change intelligible within a rational metaphysics.

The distinction operates concretely in everyday observation. When a painter mixes colors, the original pigments corrupt—they lose their distinct qualities as they blend—yet the mixture itself is a genuine generation of something new. Similarly, when wood burns, it corrupts as fuel while heat is generated; when bread nourishes the body, nutrients are generated from the bread's corruption. Aristotle's system showed that opposite processes like heating and cooling, growth and diminution, are intelligible transformations of substance rather than magical appearances or disappearances, grounding natural philosophy in observable change.

Where this idea shows up

67 Greek sources·1 Jewish-canon citation

Where to read it