What was the Hesychast controversy about?

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The Hesychast controversy was primarily about whether or not God could be known through moments of mystical ecstasy, specifically through the practice of the Jesus Prayer, which involved repeating the name of Jesus over and over in order to reach a state of stillness and inner peace. The controversy arose in the Byzantine Empire in the fourteenth century, and involved a dispute between the Hesychasts, who believed in the possibility of direct contemplation of God, and their opponents, who saw this as a form of heresy.

What Was the Hesychast Controversy About