Pachomius was a soldier in the Egyptian army in the 3rd century when he first heard the call of Christ. He was inspired by Christians who voluntarily visited the soldiers and daily brought them food. Upon discharge from the army he was baptized and went to live an ascetic life in the desert. He soon turned to communal life with other monks and established the first organized structure for monastic communal living as we recognize it today. He also wrote the first monastic rule that is still in use in the Eastern Orthodox Church, and at his death in 346 he was abbot-general over 11 monasteries with 7,000 monks.
From the Prayers of St. Pachomius:
O Heavenly King, Comforter, Spirit of Truth, Who are everywhere present and fillest all things, Treasury of good things and Giver of life: Come and dwell in us, and cleanse us of all impurity, and save our souls, O Good One.