The Soul/Self is neither the body, nor the mind, nor the intellect, nor the world. The Soul/self is neither the breath, nor the heart. Soul/Self is in the form of the spirit / Consciousness.  The experience of duality is mere mirage created out of the Soul/spirit.  Thus there is no second thing other than the soul/self. Therefore, holding anything else other then the soul/self as god is ignorance caused by illusion.   The one which powers the illusion is the soul/spirit is real and eternal. 
Blinded with the illusion very few grasp the non-dual truth. Only few escape from the web of illusion, only few seekers are able to acquire non-dual wisdom.