Columbia subject headings:
Prayer--Christianity--History--Early church, ca. 30-600.
Spiritual life--Christianity--History of doctrines--Early church, ca. 30-600.
Spirituality--History of doctrines--Early church, ca. 30-600.
Harvard subject headings:
Prayer--Christianity--History--Early church, ca. 30-600
Prayer--Christianity--History--Early church, ca. 30-600--Congresses.
Spiritual life--Catholic Church--History of doctrines--Early church, ca. 30-600--Congresses.
Spiritual life--Christianity--History of doctrines--Early church, ca. 30-600.
Spirituality--Christianity--History--Early church, ca. 30-600--Congresses.
Spirituality--History of doctrines--Early church, ca. 30-600.
Princeton subject headings: