The GNU Free Documentation License states (Note: the following has been wikified and is unofficial):
This License applies to any manual or other work that contains a notice placed by the copyright holder saying it can be distributed under the terms of this License. The Document, below, refers to any such manual or work.
... Radewijns, the founders of the
Brethren of the Common Life. His writings are
all of a devotional character and include tracts and
meditations, letters, sermons, a life ...