In J.D. Salinger's story "Teddy," a young spiritual prodigy of the same name describes his moment of enlightenment at age six: "My sister was only a very tiny child then, and she was drinking her milk, and all of a sudden she was God and the milk was God. I mean, all she was doing was pouring God into God, if you know what I mean." Pouring God into God -- a charming restatement of the All in All. One might add that the protagonist presumably experienced himself at this moment as God watching God poured into God, since we certainly don't want to leave anyone out.
The Sufis have a saying that only God can know God. This presents a bit of a problem for those seeking to know God, since the seeker by definition can never know that which he seeks. Yet we are seemingly egged on at every turn. "Seek and ye shall find," Jesus promised. It is certainly true that the finders have usually been the seekers -- but only after realizing they have been chasing a dream. More to the point, the seeker chasing this dream is part of the dream. They discover that the dream is real but the one who is dreaming it is not. God has awakened to the cosmic absurdity of God seeking God.