I tried to find Him on the Christian cross, but He was not there; I went to
the Temple of the Hindus and to the old pagodas, but I could not find a
trace of Him anywhere.
I searched on the mountains and in the valleys but neither in the heights
nor in the depths was I able to find Him. I went to the Caaba in Mecca, but
He was not there either.
I questioned the scholars and philosophers but He was beyond their
understanding.
I then looked into my heart and it was there where He dwelled that I saw
Him; He was nowhere else to be found.

Often misattributed to Mawlānā Jalāl ad-Dīn Muhammad Rūmī <http://en.wikipedia.org/wiki/Jalal_ad-Din_Muhammad_Rumi>.