To Alexander Roman and Ghosty, have you read the treatise that St. Thomas Aquinas wrote 10 years before Lyons II?
**CHAPTER 5 How Jesus is to be understood as Son of the paternal essence. **
From this it is clear how is to be interpreted what in the same work Cyril is led to say: “How, therefore, will Jesus, the Son, be a product of the Father’s essence?”
*[Note: Lib. 47, 29-30, enlarging on the Thesaurus ***. 33 (PG 75, 508 D); the Greek text of Cyril reads: he (the Son) is endowed with the divine dignity of the paternal essence.]*For he is not called the Son of the Father’s essence as if he were begotten by the essence of the Father, but as it were receiving by generation the essence of the Father. And this is how all similar statements are to be interpreted, as, e.g., the Son and the Holy Spirit are said to proceed by essence.
*[Note: Proceed by essence: a phrase often used in the Lib., namely by Pseudo-Athanasius, e.g., Lib.3, 14; 3, 19; 4, 11; 11, 57, etc. *in so far as by proceeding they receive essence from the Father.]
josephkenny.joyeurs.com/CDtexts/ContraErrGraecorum.htm#5*
I don’t really see the relevance of this. All it is saying is that the Divine Essence is common to all three Persons.
Peace and God bless!