Philotheus of Sinai was a Christian monk and writer who lived in Egypt. He lived sometime before 1100 – most likely during the 9th century, or possibly the 10th century. Very little is known about his life.^[1]

Philotheus was thehegumen ofSaint Catherine's Monastery (also known as the Monastery of the Burning Bush) in theSinai Peninsula.^[1]

Philotheus of Sinai followed the Sinaitic ascetic tradition ofJohn Climacus.^[1] His writings are similar to those ofHesychius of Sinai.^[2] John Climacus, Hesychius of Sinai and Philotheus of Sinai are often considered to form a single Sinaitic literary and spiritual tradition.^[3]

His40 Chapters onWatchfulness (Greek:νηπτικὰ κεφάλαια,romanized: nēptiká kephálaia) are included in thePhilokalia.^[2]

• Nepsis (watchfulness)

• 9th-century births
• 9th-century deaths
• Philokalia
• 9th-century Byzantine writers
• Eastern Orthodox priests
• Hegumens
• Egyptian Christian monks
• 9th-century Christian abbots

• Articles containing Greek-language text