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Cavaradossi
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The most technical Patristic explanation of this relationship actually comes from a Cappadocian Father, Gregory of Nyssa, when he writes:
That certainly cannot be what St. Gregory of Nyssa means. Saying that the Holy Spirit exists through the Son is the same as saying that the Son participates in the hypostatic procession of the Holy Spirit.If, however, any one cavils at our argument, on the ground that by not admitting the difference of nature it leads to a mixture and confusion of the Persons, we shall make to such a charge this answer—that while we confess the invariable character of the nature, we do not deny the difference in respect of cause, and that which is caused, by which alone we apprehend that one Person is distinguished from another—by our belief, that is, that one is the Cause, and another is of the Cause; and again in that which is of the Cause we recognize another distinction. For one is directly from the first Cause, and another by that which is directly from the first Cause; so that the attribute of being Only-begotten abides without doubt in the Son, and the interposition of the Son, while it guards His attribute of being Only-begotten, does not shut out the Spirit from His relation by way of nature to the Father.
Another good illustration comes from St. John of Damascus, who is often cited by Eastern Orthodox as a counterpoint to the filioque but when he actually illustrates his teaching he demonstrates precisely the Latin teaching of the filioque. He says:Think of the Father as a spring of life begetting the Son like a river and the Holy Ghost like a sea, for the spring and the river and sea are all one nature.Think of the Father as a root, and of the Son as a branch, and the Spirit as a fruit, for the substance in these three is one.The Father is a sun with the Son as rays and the Holy Ghost as heat.
One of these very examples are the ones used by Gregory II in support of his Tomus at Blachernae. The Father is the sun, the Son is the ray, the Holy Ghost is heat. Even though all three of these have a common essence, which is hidden from us that comes directly from the sun. Through the rays, the heat is sent upon us, and we receive the energy of the sun. These analogies support the Orthodox position of the energetic manifestation of the Spirit through the Son.
In all of these examples the Holy Spirit proceeds from the Son, while being derived (along with the Son) from the Father alone. There can be no division of the Divine Energy from the Divine Nature; they are transmitted at once because the Divine Energy is nothing else but the activity of the Divine Nature, and it would be like transmitting “wetness” separately from “water”. What is actually being described is that there is a difference between the essential origin, which of course is the Father, and the manner in which this essence “becomes” the Holy Spirit, which is universally said by the Fathers to be “through the Son”, just as the origin of the water that makes the sea is the spring, but this water (along with its natural “wetness”) comes to the sea through the river.
The problem with this example is that water is not exactly what the common essence of the spring, river and sea would be (this is a limitation of this metaphor), just as the physical matter which composes you or me is not what our human nature is. The essence or nature of the spring, river and sea, assuming they were consubstantial, would literally be some metaphysical ’ thing’ which is the commonality between their separate existences.
This is why the sun, ray, heat (or light) metaphor is better: there is no physical commonality between them which we could confuse with being the essence. In this model, there is one hypostasis, the sun, which causes the existence of two other hypostaseis, the ray and the heat, and the three together have some common essence which makes them all identifiable as part of the same being (that is, consubstantial). This essence is unknown to us (just like the essence of the Trinity would be unknown to us). The sun, rays and heat, however, are able to interact with us through it’s energy, which is conveyed to us from the sun, through the rays and in the heat.