"Jesus said:-"Those who seek should not stop seeking until they find. When they find, they will be disturbed. When they are disturbed, they will marvel, and will reign over all." (Gospel of Thomas 2)
"The Kingdom of God is inside you and all around you, Not in a mansion of wood and stone. Split a piece of wood and God is there, Lift a stone and you will find God." (Gospel of Thomas)
If one experiences Non-duality as a person then it proves that he had attained only yogic condition not Gnana or wisdom. Such experience vanished because it is impermanent because it was not the highest insight. The Gnani, however never loses his Gnana. Dislodging a Gnani from his insight is an impossibility.
Once one has thoroughly seen the truth he simply can't fall away from it. Many are enjoying a similar sort of mystic exaltation and peace, but whether it passes away soon or endures the whole of life, it is not Gnana, because it did not come through striving to investigate the nature of the world, which confront them, it came only through meditation on the self; that is the yogic reward for such meditation but it is only one half.
The Gnani not only gets such inner peace but also truth because he has turned outwards also and grasped the truth about the matter, which is as much consciousness as his innermost self.
The Yogi and mystics dip into their selves but they do not understand that that is only one half of the truth and that this dipping is also a mental discipline to fit their minds to understand the true nature of the world confronts them , which understanding they must next get if they are to become Gnanis.
The knowledge of both matter (mind or universe) and spirit (soul or consciousness) is the True knowledge.
Man is living in the body, which is the universe, and he has to earn to eat and live in the world within the waking experience. Man and his practical life and practical world are reality within the waking experience, but waking experience is mere an object to the formless subject.
One cannot get away from waking experience. It has appeared on its own and disappears on its own. Man is born, lives and dies within the waking experience. Therefore seeker ought to know, understand and grasp its meaning. The yogi or mystic who refuses to do so is refusing to face the whole of reality.
Those who say they have come into contact with God” merely imagine or assume. How do they know the ultimate meaning of God?
Deeper self-search requires the seeker to be sharp and active in order to examine the world and discriminate. The non-dualistic Nirvikalpa Samadhi means knowing that the man, universe and its contents are not different from consciousness, as the dream mountain is not different from consciousness, knowing which they automatically come to realize everything is consciousness. This is different from Yogic Nirvikalpa Samadhi, which is only deep sleep or thoughtlessness.