First off, let me preface the discussion of Barlaam’s views with the fact that we don’t clearly know exactly what Barlaam himself was saying in his own words; we rely primarily on St. Gregory’s responses and quotations of Barlaam. It’s quite possible that Barlaam was misrepresented, but for our purposes it’s only necessary to know what Palamas was arguing against, not what Barlaam necessarily believed.
Basically Barlaam was arguing that when someone receives Grace, they are not receiving Divinity itself, but rather a natural modification that makes us more like God than we were before. It would be like transforming us into angels, or closer to being like angels. He said that we receive this change by God, mediated through created things. This is what Barlaam meant by “created Grace”, namely that Grace is a creaturely nature that more closely approaches the perfection of God, and can only be achieved by God modifying us (this is the basis for the Palamite rejection of the term “created Grace”, incidently, though Latin theology doesn’t mean by it at all what Barlaam meant).
Palamas, on the other hand, argued that we really share in the Divine Life itself through Grace, and we’re not merely transformed in a manner creatures, but in a manner that goes beyond “creatureliness”, a supernatural (Divine-level) alteration. We retain our creature-nature, of course, but at the same time we participate in Divine-nature, and hence we are adopted Sons of God as opposed to natural Sons of God (which only the Son Himself is). Since the Divine Nature is uncreated, Palamas countered Barlaam’s terminology by saying that we share in “uncreated Grace”, and it should be noted that Latin theology uses the term “created Grace” to refer to what Palamas is describing, for the reason that the Divine Participation is made in us, and that we are not eternal extensions of the Trinity.
Barlaam countered that the Divine Nature is infinite, unchanging, almighty, ect. If we participate in it, then we must become totally infinite, and in all things Divine, and therefore become God not in the sense of adoption and participation, but on the fundamental level of nature, ceasing to be creatures and transcending to become a member of the Trinity. If God transcends all created nature, then to reach God we must become exactly what God is, we must aquire the Divine Essence as our own essence, and this is impossible.
To answer this Palamas utilized a new approach (and yes, I believe that St. Gregory’s theology was new, and wasn’t a direct continuation of the theological language of previous centuries, though it was absolutely developed from it and is truly Apostolic in that sense) and started emphasizing that the Divine Nature is certainly “in Essence” infinite and utterly transcendent in Itself, but that it also “reaches out” and touches created things, whether interacting with them or constantly providing them with existence from nothing. It seems like a paradox, but it is a logically necessary paradox (and not a contradiction), since if the transcendent Divine Nature didn’t reach out, nothing else would exist. So this theological approach hardened into the distinction between Divine Essence, what the Divine Nature is considered in Itself, of Itself, by Itself, and this is totally unknowable by creatures by definition, and the Divine Energy, which is this same Divine Nature reaching out and really connecting with (and, in the case of Grace, sharing Itself with) creaturely reality. While creatures can share in the Divine Nature and directly see God, we can never see God as the Father sees and knows Divinity; in Latin terms we have knowledge, but we lack comprehension. This infinite mode is “Essence” because everything else about God hinges on this mode; if God does not exist infinitely and transcendently in the first place, God can’t reach Himself out.
The Energy is mode in which the Divine Nature can be received by creatures, in proportion to their ability to receive, and this distinction safeguarded the utterly transcendent and eternal aspect of the Divine Nature that Barlaam accused Palamas of ignoring. Barlaam was trying to protect the transcendence by denying a real participation in Divine Nature, because he was insisting that the only mode of participation would be the mode of sharing the same Essence, as the Father and Son do; Palamas was hardening the language of Essence and Energies to express that the Divine Nature really is shared with creatures in a manner that is distinct from the “Essence to Essence” sharing of the Father and Son.
Incidently, it’s been noticed by many that the Barlaam/Palamas debate closely reflects, in some crucial aspects, the Protestant/Catholic debate. Most significantly in the Western debate over imputed righteousness (Protestant), and infused righteousness (Catholic). Certain Protestants argued that God “calls us Holy” in overlooking our still-existant sinfulness, whereas the Catholics argued that God makes us Holy by infusing us with His own Divine Nature and Holiness in Grace. For the Protestants, Grace was viewed as a kind of dispensation and creaturely turning towards God for mercy (accept Jesus as your Lord and Savior kind of thing, but with the understanding that even this is done with God’s help) while the Catholics viewed Grace as both a Divine help and “nudge”, and also the sharing of Divine Life with the soul by the Sacraments and prayer.
I know that’s long, but hopefully it helps clear up the reasons for the language being used.
continued…