Until and unless the seeker of truth finds the fact that, the religion, scriptures, god/guru glorification or chosen paths are inadequate and useless, in quenching his spiritual thirst, and finds them all as method of dead words, and then only he will be able to grasp and realize the non dual truth.
Truth pursuit is for those who has intense urge to know the truth of their true existence, and receptive mind, which has the courage to accept only uncontradictable truth, and reject the untruth. People who are emotionally and sentimentally involved with religion, god and scriptures and gurus and yoga should avoid indulging in pursuit of truth.
Religion, scriptural studies, theories, concept of god and yoga are valuable for those who do believe their present physical identity (ego) as real, and world as reality. And it helps to manipulate the worldly life.
Since pursuit of truth is a very personal journey, and there is nothing is needed other then verifying “What is mind?” and “What is substance of the mind?” Religion, concept of god, scriptural knowledge becomes big obstacle in realizing the non dual truth, because they are based on the body (waking entity) as self, whereas the non dual truth is based on the soul/Atman as self.
Since everyone is viewing the worldview on the base of object as subject (body or waking entity’) due to ignorance, they have to become aware of the fact that ,the true subject, is Atman by rectifying the reasoning base, from form, to formless, mentally in order to acquire the nondual truth.
Inquiry and reasoning on the true base revels the fact that, neither physical body, nor the ‘I’, the true self. The formless witness of the ‘I’ is the true self. The formless witness is Atman(consciousness). The three mental states of waking, dream and deep sleep are unreal, because they have no permanence. Man and his experience of the world is reality within the waking or dream. But the point is, the waking is also as unreal as dream. They come and go. Thus one has to realize the fact that there must be a knower (witness) of these three states which appear and disappear in succession.
One has to trace the source of the three states, from where they appear and disappear. The source is the witness and the true self. This has to be grasped mentally by constantly reflecting on the source until one gets the firm conviction that, the source itself is the true self, and the source is formless Atman or consciousness. Once this conviction becomes firm, then the true base is formed mentally, and one will be able to view and judge the three states on the base of the formless subject.
On the base of formless subject(Atman), the three states become an object to the formless subject(Atman), and one will be to view and judge the three states on the base of Atman and realize the fact that waking or dream which consist of man and the world are unreal, on the standpoint of the formless witness. This is the first step the seeker has to take. Once the true base is formed mentally then the truth will start unfolding on its own.
It takes a long time to form the base mentally, but for those who are free from religion; scriptural knowledge and the concept of god and yoga can grasp it with lesser time and effort.