Columbia subject headings:
Asceticism--Orthodox Eastern Church.
Orthodox Eastern Church--Doctrines.
Prayer--History of doctrines--Early church, ca. 30-600.
Spiritual life--Orthodox Eastern Church.
Harvard subject headings:
Asceticism--Orthodox Eastern Church.
Christian literature, Early.
Orthodox Eastern Church--Doctrines.
Spiritual life--Orthodox Eastern Church
Princeton subject headings:
Asceticism--Orthodox Eastern Church.
Orthodox Eastern Church--Doctrines.
Spiritual life--Orthodox Eastern Church.