A short digest of Plutarch's treatise on how Plato's Timaeus says the World-Soul was mixed from Same, Different, and intermediate substances.
This brief epitome condenses a longer treatise, 'On the Generation of the Soul in the Timaeus,' in which Plutarch works through Plato's account of how the World-Soul was constructed. It surveys the geometrical, arithmetical, and musical analogies Plato uses, and defends a reading in which the soul is neither pure unmoved intellect nor mere number, but an intermediate reality blending an indivisible, intelligible substance with a divisible substance that clings to matter and perceptible change.
The text moves through several technical disputes: it criticizes the followers of Posidonius for treating the soul as a geometrical 'idea' rather than something ordered by number, and it works out why Plato calls the soul's lower aspect 'divisible' - because whatever perceives or imagines must extend alongside the scattered, changeable things it perceives. A key move is distinguishing two circles in the soul, the Same and the Different, tracing the Same back to Plato's principle of the One and the Different back to the Dyad; their mixture in the soul produces both intellection (mind moving among unchanging universals) and opinion (perception moving among particulars), with imagination and memory serving as go-betweens.
The treatise closes by comparing this psychic blending to the physical blending of the cosmic body, where fire and earth, being unmixable extremes, were joined only through the intermediaries of air and water. In the same way, the Same and the Different - opposing principles - were not fused directly but through intermediate, ranked substances, so that the World-Soul ends up 'something alike out of things different, and one thing out of many.' The piece matters as a compressed window into how later Platonists tried to reconcile Plato's mythic cosmology in the Timaeus with a coherent metaphysics of mind and matter.
“He also says that vice arose as an offshoot of matter, so that, as he puts it, the divine should not be thought the cause of evils.”
— Epitome Libri De Animae Procreatione · read this chapter →
“the one is ever in motion, the other unmoved, and the one is unmixed with the perceptible, the other bound up with body”
— Epitome Libri De Animae Procreatione · read this chapter →
“that being, and space, and becoming are three, in three distinct ways, even before the heaven came to be”
— Epitome Libri De Animae Procreatione · read this chapter →
“the Same from the One, the Different from the Dyad; and it is here, in the region of the soul, that they are first mixed, bound together by numbers, ratios, and harmonic means”
— Epitome Libri De Animae Procreatione · read this chapter →
“fashioning something alike out of things different, and one thing out of many”
— Epitome Libri De Animae Procreatione · read this chapter →
It is a condensed summary of Plutarch's treatise on Plato's Timaeus, explaining how the World-Soul was mixed from an indivisible, intelligible substance and a divisible substance tied to matter and perception. It works through the geometrical and numerical language Plato uses and defends a particular reading of the soul's composition.
He holds that matter is eternal but was given shape by the divine acting through the soul, and that the soul occupies a middle position, sharing in both the eternal intelligible and the changeable, perceptible realm. Vice is traced to matter itself, so that the divine is not blamed for evil.
They are the two governing circles or principles within the World-Soul: the Same underlies intellection and knowledge of universals, tracing back to Plato's principle of the One, while the Different underlies opinion and perception of particulars, tracing back to the Dyad. Their mixture produces reasoning, imagination, and memory.
He argues they wrongly treat the soul as a geometrical 'idea' - something unmoved and unmixed with the perceptible - when in fact the soul is constantly in motion and bound up with body. He insists Plato meant the soul to be ordered by number, not to be number or an idea itself.
It offers the physical blending of the cosmic body - where unmixable fire and earth are joined only through intermediary air and water - as an image or analogy for how the soul's opposing principles, the Same and the Different, were joined through intermediate substances rather than directly.
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