If and only if one wants to be unaffected by mental suffering completely then one has to acquire self –knowledge in a systematic way by proper and perfect understanding. One has to free himself from theory of karma and reincarnation by proper understanding. Theories are only theories speculated and imagined on the base of the false self. One need not believe it. BUT it is essential that one understands the present birth, life and death itself is illusion. After this understanding one will progress in path of truth and ultimately reach his non-dual destination. After reaching this goal he will know whether the present birth, life and death are true or not. The inherited conditioning from parental grooming makes on think he is an individual separate from the world, and world existed prior to him. This conviction is deep-rooted and causes the ignorance of the true existence.
In reality the physical existence is mere mirage. Therefore, there is new approach is needed in assimilating the self-knowledge. Instead of arguing on the base of the false self, with the logic and accumulated knowledge, one has to verify the validity of his own belief and accumulated knowledge by himself by deeper thinking, inquiring, analyzing and reasoning.
Reasoning on the true base is a perfect science. There are two types of people. People who are not intelligent enough to doubt or raise questions about their inherited beliefs, such people normally follow the belief system which they have inherited. When some people from other faith convinces them that their beliefs are wrong they will discard them and have a new set of beliefs, meaning they get converted to one belief system to another. Whoever follows whichever belief system will never be completely secured and happy with their belief system. They would like to protect their belief and claim that they hold the right set of belief. However, internally they are never completely sure.
The second set of people is intelligent to raise questions and demand explanations for all the beliefs that are they have inherited from their grooming. They do not want to accept anything without proof. They are always searching for un- contradictable truth. They are the real truth seekers.