Western mysticism : the teachings of SS Augustine, Gregory and Bernard on contemplation and the contemplative life : neglected chapters in the history of religion - Butler, Cuthbert, 1858-1934 (London : Constable, 1922)
Keywords: Augustine, -- Saint, Bishop of Hippo; Bernard, -- of Clairvaux, Saint, -- 1090 or 91-1153; Gregory, -- I, -- Pope, -- ca. 540-604; Contemplation; Mysticism