Many People adopt the attitude that what they know is truth and what others say is false. This attitude makes them not to verify anything other then what they know. One needs to be rational, not merely logical. Logic is has its value only in physical plane.
As one advances towards spiritual plane he sees the logic underlying experience and becomes more rational. His reasoning is two-fold--implicit and explicit.
There is a need of facts of physical proof in scientific invention, whereas in pursuit of truth the proof has to be grasped mentally and realized. Therefore, the truth is realized only by few who take this mental pursuit. “Whatever facts revealed, which is un-contradictable has to be accepted as truth.
The truth based on the formless soul or consciousness, the innermost self is worthwhile; without it, one has something else, not truth. Most people refuse to venture into pursuit of truth; because they do not want to go into the root of things.
Until one gets firm conviction of the ultimate truth he has to constantly reflect on the nature of the true self, till he achieves the equilibrium. Thus renouncing the worldly life is not necessary in order to acquire non-dual wisdom.
This universe is but a state of ignorance. In reality universe is nothing but illusion created out of consciousness. The existent and non-existent of forms, name and things do not lose their inherent nature. The consciousness self-existing, which knows both existence and non-existence, never ceases to be because it is cause of the illusion and it itself is uncaused.
The nature of the consciousness, which is the true self, is free from mental contents (three states), effortless, immutable, and spotless is neither far way nor near but ever present in all the three states as their formless substance and witness. When the formless substance and witness are one in essence the three states are mere mirage created out of that formless essence.
The universe exists because of consciousness. The moment the ignorance vanishes the universe with all its contents becomes unreal. Thus realizing the unreal nature of the universe or waking experience in the midst waking experience leads to self-awareness. Self-awareness frees one from experiencing the waking experience as reality.