The medieval mystics and devotional writers of Western Europe produced a significant body of literature, much of it attaining a high artistic level. They wrote in poetry as well as prose, and though autobiography was a favored mode, they could at times write lyric poems, parables, and even drama. The non-fiction expository treatise was by far the genre they preferred—one that few today would consider “literature”. But medieval people did not think quite so much in terms of genre as we do, and many of the devotional treatises written in the Middle Ages rise to the high level of artistry that we associate with this term.
Surveying a field as vast and varied as that of medieval mysticism demands selectivity, even …
Boenig, Robert. "Medieval Mysticism". The Literary Encyclopedia. First published 18 July 2008
[http://www.litencyc.com/php/stopics.php?rec=true&UID=5537, accessed 28 February 2017.]