Praktikos and Chapters on Prayer
Πρακτικός; Περὶ προσευχῆς
Evagrius Ponticus (345–399), a student of Gregory of Nazianzus at Constantinople who withdrew to the Egyptian desert, composed the Praktikos — one hundred chapters on overcoming the eight logismoi (destructive thoughts) — and the Chapters on Prayer, 153 chapters that constitute the first systematic theological account of pure or imageless prayer. Together they form the psychological and theoretical foundation on which all subsequent hesychast writing was built. Evagrius's speculative theology (including the pre-existence of souls) was condemned at the Fifth Ecumenical Council in 553, so the Chapters on Prayer circulated throughout the Byzantine period under the name of Nilus of Ancyra; modern scholars have reattributed them to Evagrius, but medieval and early modern court readers knew them only under the pseudonym. The Praktikos appears under Evagrius's own name in the Philokalia.