It is in that calm, mirror-like, pure mind that the ultimate, absolute, blissful Reality, the Brahman is reflected.
This is what the Kenopanishad means when it says: “That which even the mind cannot reach but because of which the mind acquires the faculty to comprehend; That, O seeker! is the true Brahman, nothing that you worship here.”
M: But, doesn’t the mind become inert like that of an idiot by ceasing to think and reason?
Master: How can the mind which reflects the very seed and source of intelligence ever become inert? Such a mind is ever active, ever engaged in doing what has been ordained as its duty. Such a mind, blessed by an abundant rush of energy, as it is linked to the very fountainhead of the tremendous energy that operates the entire universe, is not ruffled by obstacles or failures. It gets neither dejected by failure nor overjoyed by success. It is a mind that works steadily without the distractions that the ordinary person has. It is only such a mind that can be truly said to function, charged as it is with the energy from the Universal Generator. The rest are all inert because they have not discovered the secret of work.
The only experience or state of being whose content cannot be subrated (subrate–a mental process whereby one disvalues some previously appraised object or content of consciousness because of its being contradicted by new experience) in fact and in principle by any other experience—which no other experience can conceivably contradict—is the experience of pure Spiritual Identity; the experience wherein the separation of self and non-self, of ego and world, is transcended.
Let us look at the minds of some great persons who were not merely thinkers but doers. Adi Shankara was one of the foremost exponents of Advaita Vedanta—I shall go into it later—and he was a sannyasin par excellence. In a short span of 32 years, he did what ordinary people would have taken a hundred years or more to accomplished, or perhaps, would not even have accomplished in quite a few lifetimes. He travelled on foot through the length and breadth of this vast country, wrote voluminous commentaries on the scriptural texts, engaged numerous scholars of the day in debates, and renovated temples wherever he went. And he was successful in everything, for he had understood the secret of work.
Take a more recent example, the great Vedantist, Swami Vivekananda. One cannot but be overawed by the stupendous work that the Swamiji did. What a towering personality and what a tireless worker for the good of humanity! You yourself can think of many examples like these.