The aim of this article is multiple.First, it weighs a series of reasons for which mysticism is still relevant for the analysis of man's current human condition.Second, it proposes promise and absence as the devices of mysticism.Third, it exhibits, according to the reading of Alois Haas and Amador Vega of some of Meister Eckhart's German sermons and Angelus Silesius' The Cherubic Wanderer, the fundamental expositions of these authors' mysticism, namely: voidance of the soul, co-conceivement, God's abyss and mystical union.At the same time it outlines how the thought of Eckhart and Silesius, besides being studied, produces echoes in some of the most important philosophical formulations of the 20th century.