Columbia subject headings:
Concept of humility.
Gertrude, the Great, Saint, 1256-1302.
Humility--Christianity--History of doctrines--Middle Ages, 600-1500.
Spiritual life--Christianity--History of doctrines--Middle Ages, 600-1500.
Harvard subject headings:
Gertrude, the Great, Saint, 1256-1302.
Princeton subject headings: