It is important to distinguish between the object which can be grasped by the senses I.e. the tree in the yard and the metaphysical reality which makes that perception possible. That reality is not itself perceptible but it can be realized. That realization does not refer to a special mental condition or continuing experience. Sankara in BSBh rejects the notion that samadhi is equivalent to the highest realization. He regards it as just another state of mind.
What meaning then can we give to the notion of realization? It is of course an unshakable belief in the unity of Being, the I AM that Nisargadatta focussed on during the time of his sadhana. It creates a transformation in the qualities of the person, those that can be experienced by others. It must be said that a penchant for the collection of Rolls Royce cars and high end watches is a counter indication of realization. Spontaneous compassion and immediate insight into the spiritual condition of others is an essential indication. Being in the presence of a sage can raise one’s own awareness to the point that instruction seems to come from within. I’m not sure that faith in him is even necessary. It's a matter of spiritual harmonics.
