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Hesychasm is a mystical tradition of contemplative prayer in the Eastern Orthodox Church. Based on Christ's injunction in the Gospel of Matthew that "when thou prayest, enter into thy closet, and when thou hast shut thy door, pray", hesychasm in tradition has been the process of retiring inward by ceasing to register the senses, in order to achieve an experiential knowledge of God (see theoria).
"the quest for such union through the Jesus Prayer", the earliest reference to which is in Diadochos of Photiki (c. 450);
Lord Jesus Christ, Son of God, have mercy on me, a sinner.