An interesting question, to which many an answer has been directed.
One in particular, however, deserves a post of its own. Take it away, M. R. Bawa Muhaiyaddeen:
God has no form. He has no shadow. There is nothing in comparison to Him. He has neither wife nor child. He is neither darkness nor light. He is not like the sun, nor the moon, nor the stars. God is one power, a power which is able to control and subdue all other powers. From the single atom to all of the universes, this is a power which is intimately mixed within all things. It has nothing, no shadow, no aid. It is the One who is alone, the Original One. It is a point, a power, which has neither beginning nor end. There is no language for it, nor does it have a religion. It does not possess a race; there are no colors in it, no black or white. It is a power, a point which is within every creation.
It has no mouth, no tongue to speak, yet through our mouths that power is speaking. It has no eyes, yet it is observing through our eyes. It has no ears, yet it replies to the sounds that we hear with our own ears. It has no nose, but it senses fragrance through our sense of smell. It has no hands, but that power makes our hands the agency for giving and receiving. It has no feet or legs, but it walks throughout all the universes. Such is that power.
The mind cannot see this power. The mind has the form of a demon. Earth, fire, water, air, and ether are the form of this demon. It is the essence of the elements, the form of spirits or vapors, the form of desire and illusion. Therefore, mind and desire cannot see or pray to God. God is that treasure which transcends mind and desire. If we want to see that treasure and realize it, then we have to understand ourselves. Only wisdom can understand that treasure, and if we want to realize God, then we must acquire His qualities within ourselves. Those qualities create a different form within us, the form of His beauty. God can never he seen. It is God’s qualities which are His beauty, and the light which radiates through those qualities is His power. Those qualities are His form and that light is His power. That is God.
Look are this Sufi master’s website — a site created for him several years after his passing from this world — to see just how direct an experience he had of the words he conveys.
Such experience is worthy of our respect.