Book 12
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As for thoseSpeusippus and his followers; cf. Aristot. Met. 7.2.4, Aristot. Met. 14.3.8. who maintain that mathematical number is the primary reality, and so go on generating one substance after another and finding different principles for each one, they make the substance of the universe incoherent (for one substance in no way affects another by its existence or non-existence) and give us a great many governing principles. But the world must not be governed badly:
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The rule of many is not good; let one be the ruler.Hom. Il.2.204.
