What is Saint Gregory Palamas's "essence-energies distinction," and why does it matter?

The Orthodox nuance

The story has a precise context. On Mount Athos, in the 14th century, hesychast monks, who prayed the Jesus Prayer at length, testified that they sometimes saw a light, the same light the Apostles had seen on Tabor at Christ's Transfiguration. A monk who came from Calabria, Barlaam, rejected this as a delusion, saying that if that light were truly God, it would mean God's essence could be seen, which he considered unacceptable; the light, therefore, had to be merely something created, a symbol, nothing more.

Saint Gregory Palamas responded with the theological tool that was missing. God's essence, he says, remains forever inaccessible and incomprehensible, keeping here the full transcendence we spoke of regarding apophatic theology. But God's energies — His glory, His grace, His light — are not something created, separate from Him; they are God Himself at work, truly communicated, truly shareable. The light seen by the hesychasts was neither a created symbol nor God's bare essence, it was precisely that same uncreated light shown to the Apostles on Tabor.

An image can help, though not a perfect one. Think of the sun: you could never approach its body of fire without being consumed, but its light and warmth truly reach you, they are the very reality of the sun extended to you, not a drawing of the sun. When you feel the warmth on your skin, you are truly connected to the sun itself, though its body remains distant, untouched. Likewise, through the uncreated energies, man can truly unite with God, without ever merging with His essence, without risk of believing himself to be God by nature.

The practical stakes are precisely the deification (theosis) already mentioned elsewhere. Without this distinction, union with God would slip either toward too weak a notion — a mere influence from afar, a symbol — or toward pantheism, believing that man becomes identical with God's very essence. Palamas holds both together: a truly real union, by grace, without ever erasing the distinction between Creator and creature. His teaching was confirmed at the Councils of Constantinople, in 1341 and 1351, and the Church honors him on the second Sunday of Great Lent, precisely for this defense of hesychast prayer. It must also honestly be said that Western scholastic theology, especially in Thomas Aquinas, did not use exactly the same technical distinction, speaking instead of created grace, and this is one of the real, sometimes debated, differences between East and West, though some Catholic theologians of our time have looked on Palamas's thought with sympathy.