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cf., ST.I.Q93.A1.Rep2, Sent.I.D3.Q3.A1.Rep5, Sent.I.D28.Q2.A1.Rep3, Sent.I.D28.Q2.A3, Sent.II.D16.Q1.A1, Graecorum.Part1.C10, 1Cor.C11.L2, 2Cor.C4.L2, Col.C1.L4, Heb.C1.L2
The difficulty in this article is occasioned by the fact that the Spirit is also from another and shares the same nature. Thus, just like the Eastern Fathers, we should say that the Spirit is the image (of the Son).
In order to properly answer this question, we should distinguish three senses of "image."
1. Artificial Image
2. Intentional Image
3. Natural Image