Doubts arise because of an absence of surrender.
When the mind is left without anything to cling to, it becomes still.
When we turn the mind inwards, God manifests as the inner consciousness.
Apart from the body does the world exist? Has anyone seen the world without the body?
He that sees the Lord in the temple, the living body, by seeking Him within, can alone see Him, the Infinite, in the temple of the universe, having become the Endless Eye.
You are the Supreme Being, and yet thinking yourself to be separate from it, you strive to become united with it. What is stranger than this?