Columbia subject headings:
Harvard subject headings:
God--Worship and love--Early works to 1800.
Perfection--Religious aspects--Catholic Church--Early works to 1800.
Spiritual life--Catholic Church--Early works to 1800.
Princeton subject headings:
God--Worship and love--Early works to 1800.
Perfection--Religious aspects--Catholic Church--Early works to 1800.
Spiritual life--Catholic Church--Early works to 1800.