Didymus the Blind (AD 313–398) wrote: “For things of the same substance—ὁμοούσια—have the same activities, and things of a different substance—ἑτεροούσια—have discordant and distinct activities.”
This is a key basis for the doctrine of the Trinity.
Gregory of Nyssa refines the concept here by arguing that through Power, the Father’s activity produces works. Through the Son who is the Power of God, then, the Father and Son share the same activity and so works. See Contra Eunomium 3.4 or Michel Barnes.
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