Whatever is seen, whether external or internal, whether by the ordinary persons or yogis, is unreal.+

You exist within the world.  The world in which you exist is present only when the mind is present.  The mind is present only when the ‘I’ is present. So, how can you limit ‘I’ only to you when ‘I’ is the world in which you exist? Without the ‘I’ the world, in which you exist cease to exist.

Think deeply, reason deeply then only you will be able to realize ‘what is what’. Without realizing ‘what is what’ you will never be able to realize ‘what is the truth and ‘what is untruth’?

Yogi may see a hill in his Yoga, but how does he know that hill is Brahman? 

Sage Goudapada’s rational exposition of Advaita: ~ Whatever is seen, whether external or internal, whether by the ordinary persons or yogis, is unreal

First of all, you must give the meaning of Brahman!

A madman can say, “This rock is an elephant.” So until he defines an elephant we cannot say what he means.

It is no use seeing the personal God everywhere. You must see the Soul, which is present in the form of consciousness everywhere, and then you will be able to treat the world in which you exist as consciousness.

First, you must know what God is supposed to be.

There is a clear-cut idea in the scriptures, what supposed to be God. And what not to worship in place of God then why worship the belief of God, which is not God in truth.

That is why Lord Krishna says Ch ~V: ~ “Those who know the Self in truth.". The last two words (tattvataha) are usually ignored by pundits, but they make all the difference between the ordinary concept of God and the truth about God.

Bhagavad Gita: ~ Brahmano hi pratisthaham ~ Brahman (God in truth) is considered the all-pervading consciousness, which is the basis of all the animate and inanimate entities and material. (14.27)

Rig Veda: ~ The Atman is the cause; Atman is the support of all that exists in this universe. May ye never turn away from the Atman the innermost Self. May ye never accept another God in place of the Atman nor worship other than the Atman?" (10:48, 5)

Yajurveda – chapter- 32:~  God is Supreme Spirit has no ‘Pratima’ (idol) or material shape. God cannot be seen directly by anyone. God pervades all beings and all directions. 

Thus, Idolatry does not find any support from the Vedas.

Brihadaranyaka Upanishad: ~ Brahman (God) is in the form of the Athma, and it is indeed Athma itself.

People, who worship the belief of God, are hallucinating that they become one with such God.

Vedas itself declares: May ye never accept another God in place of the Atman nor worship other than the Atman? Thus, to know the real God Self-realization is necessary. Self-realization is God-realization. Self-realization itself is real worship.:~Santthosh Kumaar