Who's the Christian God? How to know Him? There is a tradition in western Christianity called mysticism. Pseudo-Dionysius and his oeuvres〈The Mystical Theology〉is the typical representative of this tradition. God is a transcendental One, and by contrast, human being's faculties are limited. Thus in Pseudo-Dionysius' mind, god is unspeakable and unthinkable. If we want to know god, the best way we could chose is what he called negative method. This method indicates that if we posit god as something, we take Him as a finite being; conversely if pose him not as something, we leave the abundance to the mighty god.