The thoughts arise only in the domain of the form, time, and space.+

Some Gurus say simply ask yourself: ~

To whom do these thoughts come? Find out the source of your thoughts?

All these thought-based teachings will not yield Advaitic wisdom because they are only knowledge based on form, time, and space. the Advaitic truth is beyond form, time, and space. 

The thoughts arise only in the domain of form, time, and space. The thoughts come to you because you exist within the domain of form, time, and space. You are the thinker. You are the false self within the false experience. Without you, the thoughts will not arise.

In the dream, the thoughts come to the dream entity. The dream entity is a thinker within the dream. The dream becomes unreal when the waking takes place. Similarly, the waking becomes unreal when Advaitic wisdom dawns. The Advaitic wisdom dawns when you realize the ‘Self’ is not you, but the ‘Self’ is the Soul, which is present in the form of consciousness.

If the ‘Self’ is not you then what is the use of asking yourself,  To whom do these thoughts come? Find out the source of your thoughts?. 

The thoughts come to you, not to the Soul, the ‘Self’ because the Soul is the ever formless, timeless, and spaceless existence.

From the standpoint of the Soul, the Self, the form, time, and space are merely an illusion.

If the form, time, and space are merely an illusion then you, your thoughts, and the world in which you exist are merely an illusion. 

Thus, what is the use of finding out about the thoughts which come to you, not to the Soul, the Self’?

Thus, Self-knowledge or Brahma Gnana or Atma Gnana is necessary to realize the truth, which is beyond form, time, and space. 

Remember:~ 

Thoughtlessness is not wisdom. The thinker, thoughts, and the world are part of the illusion. The thought will not arise without form, time, and space. The form, time, and space will not arise without the mind. The mind ceases to exist without the Soul which is in the form of the Spirit. Therefore, there is a need to know the “Self” is not limited to the physical entity (you), but it pervades everything and everywhere in the experience of diversity (waking or dream). 

Deep sleep is the state of thoughtlessness, silence, wordlessness, silence but it is not considered a  state of oneness because anyone can take a sleeping pill and will be able to get the state of Oneness. 

Thus, trying to imitate the state of oneness in duality by observing silence, thoughtlessness, wordlessness, or by yogic Samadhi or surrendering to the physical Guru, the Advaitic wisdom will not dawn. Without the Advaitic wisdom, ignorance will not vanish. Thus, getting rid of ignorance through wisdom is the only way to realize the ultimate truth, or Brahman.   : ~ Santthosh Kumaar