Anonymous 
The Cloud of Unknowing [EPUB ebook] 

The Cloud of Unknowing draws on the mystical tradition of Pseudo-Dionysius the Areopagite and Christian Neoplatonism, which focuses on the via negativa road to discovering God as a pure entity, beyond any capacity of mental conception and so without any definitive image or form. This tradition has reputedly inspired generations of mystical searchers from John Scotus Erigena, through Book of Taliesin, Nicholas of Cusa and St. John of the Cross to Teilhard de Chardin.