Yesterday
I cried out in my anger
'Who are You, Lord? ...'
and the echo came back
like a winter shout against a cliff of stone..
'.....Lord......'

Today
I whispered in my despair
'Lord, who are You? ...'
and the echo came back
like summer water over a pebble...
'......You.....'

Michael Shepherd

http://www.poemhunter.com/poem/in-the-spirit-of-rumi-21/