Search for truth begins within the duality and ends with realization of non-dual reality. The ultimate truth has to be proved, not assumed. People can interpret scriptures as they likes, in whatever way that pleases them, they simply imagine away. There are many commentaries on the Bhagavad Gita by different authors. Each one goes on spinning yarns imagining as he likes what the meaning may be. But once one becomes aware of the fact that the self is not the body then he will know what “Gita” really meant, he will see that there is only one possible interpretation, irrespective of his opinion or imagination.
Most people tend to follow a single guru or teacher. Therefore ,the more ignorant they are the easier to get them into a fold of belief system. Belief system is so strong and popular because it makes no demand on the intelligent: It simply requires belief in its founder or saint.
Has it ever struck believers to doubt whether his belief system is true? Believers never use their reason because they start and conclude that their belief system alone is true, because they never question.
Theologissts say God is a perfect being, but they have never known God, never proved his existence; hence their ascription of perfection to Him is purely self-imagined. It is impossible to prove the existence of God by any reasoning. One can only assume.
Yoga and mysticism are primitive things which appeals to the mass. But they are not the means to self-realization, because they are based on the false self, within the false experience.
Many teachers will declare that all is self, but none of them can show that this is so, none has analyzed it scientifically, and none can prove it. Rational proof is required, so that one arrive at knowing truth i.e. wisdom; theirs is mere dogma, parrotism, repetition of what they read in scripture.