The second Sunday of Lent is now given to the memory of St Gregory Palamas, the great advocate of hesychasm and the Jesus Prayer. Previously, the Byzantine rite celebrated St. Polycarp of Smyrna, who was ordained bishop by St. John the Evangelist, on the second Sunday of Lent. That commemoration has been replaced by that of St. Gregory Palamas, the famous defender of hesychasm in the 14th century. Replacing such an ancient commemoration as that of Polycarp gives us an idea of just how important the hesychast controversy was.
The monks of Mount Athos had been condemned by the monk Barlaam, an Italo-Greek monk from Calabria in Italy, who favored education over contemplation, and who emphasized the unknowability of God. The monks taught hesychasm, using the Jesus Prayer and certain body postures or breathing, so as to draw very close to God, and for some, to see the Divine Light in this lifetime. The use of the body postures was repeatedly condemned by many saints and writers, but not the use of the Jesus Prayer. This prayer, so central in our spirituality, when used well, has a profound effect.
Further, St. Gregory taught that the mystic, even without education, could have greater knowledge of God than others, but he made the crucial distinction between energies of God, and the essence of God. Essentially, God can not be known in His essence by any human, but His energies (what God sends forth in His creation), can be known. In this, he quoted the ancient Cappadocian Fathers. As for the body postures and breathing, since the person is both body and soul, uses of the body can affect the soul. In the end, he wrote that hesychasm teaches that one can see the Light of God, but only with repentance, interior conversion, constant prayer, and spiritual direction. This remains the position today, nearly 900 years later.