Wadi El Natrun, Egypt
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Abba Poemen (Greek: Ὁ Ἅγιος Ποιμήν; ποιμήν means "shepherd") (c. 340–450) was an Egyptian monk and early Desert Father who is the most quoted Abba (Father) in the Apophthegmata Patrum (Sayings of the Desert Fathers). Abba Poemen was quoted most often for his gift as a spiritual guide, reflected in the name "Poemen" ("Shepherd"), rather than for asceticism. He is considered a saint in Eastern Christianity. His feast day is August 27 in Julian calendar (September 9 in Gregorian calendar).
Abba Poemen lived at a monastery in Scetis, one of the first centers of early Christian monasticism. In 407 A.D. the monastery was overrun by raiders, scattering the monks. Abba Poemen and Abba Anoub, along with a handful of monks, fled to Terenuthis, on the river Nile. After leaving Scetis, Abba Poemen and his group first lived in an abandoned pagan temple. The various raids on Scetis were a turning point in desert monasticism. The ensuing diaspora resulted in Abba Poemen and his group keeping alive the collective wisdom of the monks of Scetis by creating the bulk of the Apophthegmata Patrum (Sayings of the Desert Fathers).
Abba Poemen's personality was described by others—including his own spiritual father—as being that of a wise shepherd more than a desert ascetic. He was known for his tolerance of the weakness of others. One apocryphal story recounts that some of the older monks approached Abba Poemen for his advice on how to treat monks who fell asleep during their prayers. They were inclined to wake the sleeping monk, while Abba Poemen took a more compassionate approach, advising, "For my part, when I have seen a brother who is dozing, I put his head on my knees and let him rest." Another story tells of a brother monk with a mistress who had a child. Rather than judging him, Abba Poemen sent him a bottle of wine as a gift. Abba Poemen was typically opposed to giving harsh penances to those who slipped spiritually—when a monk came to him who had committed a "great sin", Abba Poemen reduced his penance from three years to three days.
Abba Poemen was also described as a charismatic speaker who still taught more by example than by lecturing others. When a visiting monk asked him if he should assume a role of authority over the brothers he was living with, Abba Poemen responded by saying, "No, be their example, not their legislator." Judgment of others was also foreign to his nature. He once stated that, "A man may seem to be silent, but if his heart is condemning others, he is babbling incessantly." Modern writers credit Abba Poemen's gift of memory for keeping alive many of the stories from the Apophthegmata Patrum. Many of those stories are recollections of Abba Poemen from his time with the monks in Scetis. A later Coptic writer, Zacharias of Sakha, believed that Abba Poemen was also a writer, leading to speculation that he might have been one of the authors of the Apophthegmata Patrum.
Some scholars consider the Abba Poemen of the Apophthegmata Patrum to be merely a generic desert Abba, while others credit Poemen and his group with collecting the many sayings that became the Apophthegmata Patrum. Wilhelm Bousset and William Harmless both treat Poemen as a historical figure.
Selected sayings of Abba Poemen 
Abba Poemen is the most often quoted Abba in the Apophthegmata Patrum—nearly a quarter of the sayings are by or about Poemen—which led some scholars to think that sayings from different Abbas were collected under the generic name "Abba Shepherd." Abba Poemen is also featured prominently in another collection of Desert Father sayings, the Ethiopic Collectio Monastica. He was notable for his kindness and compassion toward his fellow monks, including those who had fallen from the high ideals of the Desert Fathers. He was frequently sought out by his brothers for his wise and compassionate guidance.
- "Many of our Fathers have become very courageous in asceticism, but in fineness of perception there are very few."
- In response to a brother monk who chided Poemen for washing his feet, he said, "We have not been taught to kill our bodies, but to kill our passions."
- One monk sought out Poemen to see if he should take a position of authority over fellow monks who he lived with. Poemen advised, "No, be their example, not their legislator."
- Many of Poemen's sayings included sets of three, such as a list of three "instruments for the work of the soul": "to throw yourself before God, not to measure your progress, to leave behind all self-will."
- Harmless, William (2000). "Remembering Poemen Remembering: The Desert Fathers and the Spirituality of Memory". Church History (American Society of Church History) 15.
- William Harmless (17 June 2004). "Abba Poemen". Desert Christians: An Introduction to the Literature of Early Monasticism. Oxford University Press. pp. 206–211. ISBN 978-0-19-516222-6. Retrieved 4 July 2012.