Wikipedia
Palamism or the Palamite theology refers to the teachings of Gregory Palamas (c.1296–1359), whose writings defended the Orthodox notion of Hesychasm against the attack of Barlaam. Followers of Palamas are sometimes referred to as Palamites.
Seeking to defend the assertion that humans can become like God through deification without compromising God's transcendence, Palamas distinguished between God's inaccessible essence and the energies through which he becomes known and enables to share his divine life. The central idea of the Palamite theology is a distinction between the divine essence and the divine energies that is not a merely conceptual distinction.
Palamism is a central element of Eastern Orthodox theology, being made into dogma in the Eastern Orthodox Church by the Hesychast councils. Palamism has been described as representing "the deepest assimilation of the monastic and dogmatic traditions, combined with a repudiation of the philosophical notion of the exterior wisdom".
Historically, Western Christianity has tended to reject Palamism, especially the Essence-Energies distinction, characterizing it as a heretical introduction of an unacceptable division in the Trinity and suggestive of polytheism. Further, the associated practice of hesychasm used to achieve theosis was characterized as "magic". More recently, some Roman Catholic thinkers have taken a positive view of Palamas's teachings, including the essence-energies distinction, arguing that it does not represent an insurmountable theological division between Roman Catholicism and Eastern Orthodoxy.
The rejection of Palamism by the West and by those in the East who favoured union with the West (the "Latinophrones"), actually contributed to its acceptance in the East, according to Martin Jugie, who adds: "Very soon Latinism and Antipalamism, in the minds of many, would come to be seen as one and the same thing".