This possession is a simple and abysmal tasting of all good and of eternal life; and in this tasting we are swallowed up above reason and without reason, in the deep Quiet of the Godhead, which is never moved... And therefrom follows the last point that can be put into words, that is, when the spirit beholds a Darkness into which it cannot enter with the reason. And there it feels itself dead and lost to itself, and one with God without difference and without distinction.

The Spiritual Espousals (c. 1340)