Greek pro-Nicenes: Moderate Realists
The Eunomian case places the principle of existence in nature rather than subject. In other words, the Eunomian instinct is that existence is accidental to created natures but essential to the divine nature. Hence, any subject having the divine nature has existence by virtue of being divine. The Eastern fathers, being moderate realists, reject the point. Existence is never a property, accidental or essential, of natures. Existence is only ever located in subjects that give concrete reality to natures – hence their use of hypostasis, or that which exists underneath a nature. In short, subjects exist; natures subsist (in subjects).[1]
[1] Jacobs, Nathan. “The begotten-not-made distinction in the Eastern pro-Nicenes.” p.523.