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In page Hesychasm:

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This stage is called the guard of the mind. This is a very advanced stage of ascetical and spiritual practice, and attempting to accomplish this prematurely, especially with psychophysical techniques, can cause very serious spiritual and emotional harm to the would-be hesychast. St. Theophan the Recluse once remarked that bodily postures and breathing techniques were virtually forbidden in his youth, since, instead of gaining the Spirit of God, people succeeded only "in ruining their lungs".[citation needed]