The teaching of St. Gregory Palamas (1296–1359) is usually considered as a paradigmatic case of Eastern Christian mystical theology. It is held that it goes beyond rational thinking and is based on antinomic premises. Contrary to this widespread view, I try to give a consistent account of two crucial ideas of Palamism: the distinction between essence and energies, and the concept of deification. In doing this, I discuss and develop some formal analyses by Pavel Florensky (1882–1937). It proves that Palamas’ teaching is no less rational than any other metaphysical theory.
