Jan van Ruysbroeck was a Flemish mystic. He led a life of asuterity, eventually founding a congregation in Groenendaal. His writings were widely circulated in his lifetime and he influenced an entire generation of Christian mystics. The writings here include The Adornment of the Spiritual Marriage, The Sparkling Stone, and, The Book of Supreme Truth. Translated from the Flemish by C.A. Wynschenk Dom. Edited with an Introduction and Notes by Evelyn Underhill.
Source and copyright Global Grey Ebooks: https://www.globalgreyebooks.com/index.html. The book can be downloaded from the Global Grey website.