Ghosty, perhaps you can answer this question that I have" What does “essence” mean in the Thomist and Palamite traditions? I suspect that the two traditions are using the word differently. Do you agree?
I haven’t done an exhaustive, academic study of this issue, but it is something I’ve focused on in my readings. It definitely seems to me that the two traditions use the term differently, at least when it comes to Thomism versus Palamism.
In Thomism, for example, the term “essence” seems to mean nothing less than “whole definition of the thing”. So St. Thomas can say without any contradiction that God “acts by His Essence”, because God is active by definition (every creature, in contrast, does not act by its essence). Since God shares His Divinity with us, we “share in the Divine Essence by participation”. In this, of course, I’m only referring to the way God is spoken of, since created things and God are spoken of quite differently in Thomistic theology, such as how St. Thomas would say that heat is an “essential accident” of fire, but that fire doesn’t heat things by its essence since the fire is not essentially in act.
In the Palamite tradition, however, it seems that Essence refers more often to the inner wholeness and foundation of being. In this manner we can distinguish between the Essence, which is the core of the being in question, and the Energy, which is the power and activity of that being. Since God is One and Infinite, His Energy is Divine and not something apart from Him, but it is distinct from His Essence because it is “expressed” rather than being at the core of being. God’s Energy follows upon His Essence, but they are distinguished as the heat is distinguished from fire.
In the Thomistic tradition, since Essence doesn’t necessarily imply a purely inward core, but encompasses everything that is “Divine”, it can be said both that God acts by His Essence, and that we participate in the Divine Essence. This couldn’t be said in the Palamite context, however, because this would imply that the Divine Essence, the very inner being of God, could enter into the composition of created things, as heat passes from fire to metal. Thomism preserves this gap between creature and Deity by highlighting the difference between the essence of created things and the Divine Essence, and also highlighting the various manners in which the Divine Essence is shared with creatures, Grace being the very highest manner of participation.
Again, this is just my layman’s interpretation, and I don’t claim any special insight beyond what some great Dominican instructors shared with me. What are your thoughts on the matter?