Columbia subject headings:
Spiritual life--Christianity--Early works to 1800.
Theology--Early works to 1800.
Harvard subject headings:
Christian literature, Early.
Spiritual life--Christianity--Early works to 1800
Theology--Early works to 1800
Theology--History--Early church, ca. 30-600
Princeton subject headings:
Spiritual life--Christianity--Early works to 1800.
Theology--Early works to 1800.