Q:-MIND is incapable of GRASPING truth, because of its dualistic [PAIR LIKE] functionality.
DAY and NIGHT.
Mind can understand Day in comparison to NIGHT.
A:- The day and night are reality within the physical existence[man+world]. The witness of the physical existence is formless and apart. Deeper inquiry, analysis and reasoning revels he fact that the self is not physical. If self is not physical then who(what) dreamt, who(what] slept ,and who(what) got up? Only when one analyzes the three states he becomes aware of the fact that, the dream was witnessed as a whole without the physical apparatus and the same witness witnessed the waking experience as a whole. Thus, judging the truth on the waking entity is erroneous, because waking entity is limited to waking experience alone and in dream it has a different identity and in deep sleep there was no identity. Therefore, the one which is aware of the three states which comes and goes is apart and permanent.
The formless witness has to be mentally traced and grasped. If one is sharp enough he will grasp it instantly. for others it takes time they have to to reflect on the subject constantly until their conviction becomes firm.
Truth means certainty. If there is any uncertainty it is not truth. It does not deal with imaginations. People do not have the scientific attitude because they take things as presented to them. They have rather the emotional and sentimental attitude. The correct attitude is to verify all the facts, to see a problem in them, something to investigate and inquire into them.
Truth must be verifiable; unless it is verifiable it is of no value. Analogical, inductive and deductive reasoning are good only within the physical existence; none are absolutely and universally infallible because they are based on the physical self. Whatever is based on the waking entity leads to imagination and speculation not towards non dual reality.
The man and his experience of the world is not separate from the mind. When one limits the mind to physical entity and views and judges the worldview all these confusion arises. Therefore, there is a need to know the fact that, the self is not physical but it is formless. When this is fact is traced then all accumulated knowledge based on the physical self becomes dross. Thus Self-knowledge is necessary to burn all the dross.
Anyone who is ready to drop the physical based/egocentric accumulated dross and has a urge to no the truth will be able to grasp it if his reasoning base is rectified from form to formless and well directed.
One has to overcome all the obstacle in pursuit of truth. This is possible only when one is free from “I KNOW” –business and has the humility to verify the facts. There is a need to stop judging on base of the accumulate egocentric knowledge, which makes one to imagine and speculate. It takes time to learn to view and judge the three states on the base of the formless witness. Once one is able to view and judge the three states on the base of formless witness, then one will have the yardstick to know “what is truth” and “what is untruth” and he will be able to mentally reject the untruth or illusion.