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In page Hesychasm:

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Books used by hesychasts include the Philokalia, a collection of texts on prayer and solitary mental ascesis written from the 4th to the 15th centuries, which exists in several independent redactions; the Ladder of Divine Ascent; the collected works of St. Symeon the New Theologian (949–1022); and the works of St. Isaac the Syrian (7th century), as they were selected and translated into Greek at the Monastery of St. Savas near Jerusalem about the 10th century.[citation needed]