Unity indicates the infinite,duality the finite.The infinite is eternal,the finite,temporal.
Let's see if after my siesta I can try to put down something about my story with ,on the one side,the human being as an egg..three layered being ..and on the other the realisation of duality and the first attempts to solve that problem .. In the end it is not really Zen that resolves it for me..and sufism I still can't really say ..but Advaita Vedanta seems to have it for me.There was some interesting stuff also on one site this morning around the traditional teachings of advaita on Brahman as creator ..I may have to take quotes at first to communicate this aspect...but it is certainly also very near to what I somehow have 'deep in my soul'.