Quote from the father of Sufism, Hazarat Ali.
This also shows the start of the thread of non-duality in Sufism which was
to continue to this present day.
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28.
The beginning, the end, the manifest and the hidden.
The seer and the listener, all is Him,
He is in everything yet He is beyond,
there is nothing else, everything is Him;
abandon the duality of me and you,
see one, there aren't two at all,
understand this and disappear in it;
when you are not, then truly He is.

from:
http://www.globale.net/~heritage/granths/kalamang.html