I was talking about the applicability of the scientific method (whatever this is) in theology.
There are mathematicians who deny most of the modern mathematics and make alternative mathematics (Intuitionism, Constructive analysis). Even within the classical mathematics there is some disagreement with respect to some axioms.
Now, I agree that these are small issues, but it is remarkable that these issues exist despite that the mathematicians study worlds invented by their own imagination and not the world created by God. When we move from study of things that are our own invention to the study of things that are creation of God, things become even more insecure.
Granted, in Physics we improve our knowledge about the nature all the time. But the knowledge of the Physics always remains an approximate knowledge. Any theory in Physics becomes replaced by another after a while. And the same goes about the other of the natural sciences. I don't deny that the human mind can discover approximate knowledge about the nature and even about God. What I claim is this: since any approximate knowledge in the theology is evil, a mixture of truth and falsehood, the scientific method must not be used as a guide by the theologian. The theologian has to rely on the divine revelation. Solum revelatione.
Right or not, nobody has described the rules of his logic. Therefore, even if his logic was correct (which I doubt), you and I still would be unable to use this logic safely as a theological instrument.
Nobody denies that there are natural truths. Do you know at least one certain natural truth that is not something trivial and comming immediately from our senses? Perhaps you are certain that tomorrow the sun will rise again?
I don't think you have to take literally the words within the braces. They are added by a modern commentator and make a specific point.
Because the O-essence is what is unknowable in the C-essence (in you confirm that God can not be "known exhaustively") while the energies are knowable.
Because we have already established that not everything about God is knowable while the energies are knowable.
Think for example about the energy you, the Catholics, call "beatific vision". Is it a manifestation of a part of the O-essence of God? No, because we all, Catholics and Orthodox, agree that there are not parts in the O-essence of God. Therefore, the O-essence of God has to be entirely manifested in the beatific vision.
When a saint reaches the beatific vision does he have exhaustive knowledge about the C-essence of God? No, you have already confirmed that this is impossible. Then what do we observe in the beatific vision? Doesn't Aquinas say this vision is observing of God as He is? Yes, he does. Now look: if we observe God as He is, but we don't observe Him exhaustively, then what do we observe? It isn't the entirety of God and it is something of God, therefore it has to be some part of God. But Aquinas says there are no parts in the C-essence of God. So at this point I can use your own words and exclaim:
"But this is of course absurd who all those who is not high on fumes of heresy."
How do we resolve this absurd? Easy! While there are no "parts" in the absolutely unknown O-essence of God, there are observable "parts" in the energies of God.
Please, friend, humble yourself and don't dispute the teachings of those who were led by the Holy Spirit. There are many useful things in the writings of Aquinas and his books are books written by a pious man. This pious man, however, has been led not by the Holy Spirit but by his own imprecise mind.