For 10 points, name this mystical belief system of silent prayer, which sparked a namesake controversy that caused a Byzantine civil war.
A treatise attacking this practice claims that its followers believe that intelligence enters and exits the human body when breath comes out of the nostrils, and spend all their time shielding their own navels to keep in divine energy. In response, this teaching was defended in the "Apodictic Treatises" and the Hagioritic Tome, along with two other works called the Triads and "Capita 150," which all cite Dionysius the Areopagite. This belief system, which comes from a word meaning "tranquility," was ridiculed for its focus on the magic of the light seen on Mount Tabor during the Transfiguration. Despite the opposition of that monk Barlaam, this system prevailed when the Ninth Ecumenical Council approved the Mount Athos teachings of Gregory Palamas in 1351. For 10 points, name this mystical belief system of silent prayer, which sparked a namesake controversy that caused a Byzantine civil war.
A treatise attacking this practice claims that its followers believe that intelligence enters and exits the human body when breath comes out of the nostrils, and spend all their time shielding their own navels to keep in divine energy.
Hesychasm [or the Hesychast Controversy, accept Palamas or Palamite teaching before “Gregory”]