Columbia subject headings:
Catholic Church--Doctrines--History.
Mysticism--Belgium--History--Middle Ages, 600-1500.
Mysticism--Catholic Church--History.
Ruusbroec, Jan van, 1293-1381.
Harvard subject headings:
Mysticism--History--Middle Ages, 600-1500
Ruusbroec, Jan van, 1293-1381
Princeton subject headings: