St. Gregory Palamas (Greek: Γρηγόριος Παλαμάς; 1296–1359) – was a monk of Mount Athos in Greece and later the archbishop of Thessaloniki, known as a preeminent theologian of Hesychasm. The teachings embodied in his writings defending Hesychasm against the attack of Barlaam are sometimes referred to as Palamism, and his followers as Palamites.
“But when you hear of the vision of God face-to-face, recall the testimony of Maximus: ‘Deification is an enhypostatic and direct illumination which has no beginning, but appears in those worthy as something exceeding their comprehension. It is indeed a mystical union with God, beyond intellect and reason, in the age when creatures will no longer know corruption. Thanks to this union, the saints, observing the light of the hidden and more-than-ineffable glory, become themselves able to receive the blessed purity, in company with the celestial powers”
~ St. Gregory Palamas, The Triads, III.i.28