Columbia subject headings:
Asceticism--Early works to 1800.
Church of the East--Doctrines.
Mysticism--Early works to 1800.
Harvard subject headings:
Asceticism--Early works to 1800.
Church of the East--Doctrines.
Mysticism--Early works to 1800
Nestorian Church--Doctrines.
Orthodox Eastern Church--Doctrines.
Princeton subject headings: