"The greatest of the Flemish mystics, Jan van Ruusbroec was conversant not only with the main currents of mystical theology in the medieval Low Countries and the Rhineland but also with the patristic heritage of both the East and the West. His personal appropriation of this legacy, together with a keen sensitivity to the needs of all the members of the church of his day and a rare gift for describing the highest levels of mystical experience, enabled Ruusbroec to produce treatises of unsurpassed beauty, perspicuity, and synthetic power."