With this approach, metaphysics regains its proper warrant, which is not sensory or mental but finally contemplative. With the eye of Spirit, God can be seen. With the eye of Spirit, the universe unfolds its innermost contours. With the eye of Spirit, noumenon announces its pure Presence. With the eye of Spirit, the Kosmos delivers its deepest secrets. And with the eye of Spirit, the intractable nightmares of the sensory and mental dilemmas yield to the radiance of Emptiness itself.
— Ken Wilber, The Eye of Spirit