The Adornment of the Spiritual Marriage, by Jan van Ruysbroeck, , at sacred-texts.com
Now understand this well: that measureless Splendour of God, which together with the incomprehensible brightness, is the cause of all gifts and of all virtues—that same Uncomprehended Light transfigures the fruitive tendency of our spirit and penetrates it in a way that is wayless; that is, through the Uncomprehended Light. And in this light the spirit immerses itself in fruitive rest; for this rest is wayless and fathomless, and one can know of it in no other way than through itself—that is, through rest. For, could we know and comprehend it, it would fall into mode and measure; then it could not satisfy us, but rest would become an eternal restlessness. And for this reason, the simple, loving and immersed tendency of our spirit works within us a fruitive love; and this fruitive love is abysmal. And the abyss of God calls to the abyss; that is, of all those who are united with the Spirit of God in fruitive love. This inward call is an inundation of the essential brightness, and this essential brightness, enfolding us in an abysmal love, causes us to be lost to ourselves, and to flow forth from ourselves into the wild darkness of the Godhead. And, thus united without means, and made one with the Spirit of God, we can meet God through God, and everlastingly possess with Him and in Him our eternal bliss.