How is Brahman known? That is the question asked in a frequently referred to sutra B.S.Bh I.i.4 .The answer is of course through the Vedas. Does that rule out any other way of knowing Brahman. The standard answer is yes; what is beyond the ken of the human mind cannot be demonstrated rationally. Yet at the same time Sankara offers in his counter to non orthodox views various indications of the intelligence inherent in the workings of creation. The world for instance cannot have come out of insentient pure matter as that would deny what we know of the cosmos and the emergence of consciousness. That in a sense is an incipient argument from design.Importantly all arguments that state that it is useless to rely on what can neither be accepted or rejected in a worldly empirical way are voided by the fact of realisation.
“...it is but reasonable that all ideas of duality, involving action, accessories, etc., should be eradicated, because the absolute Brahman is neither acceptable nor
rejectable.”
Metaphysical indications as are offered by the Thomistic 5 Ways, contingency, motion etc., are not accepted because a generalised inference cannot reach the unknowable.
Very good it is said: You have heard about Brahman but that does not mean that you now have come to a knowledge of Brahman. That would be just like having your mistaking of a rope for a snake pointed out to you. Not so is the reply: hearing, reflection, and meditation on the Self is enjoined.
At this point the Vedantin comes in to summarize and clarify everything. He mentions the things that are conducive to a state in which the truth of the Vedas will become clear. The various post mortem fates of those that do good indicate a gradation of achievement. Of course Sankara points out quoting an Upanisad: “For an embodied being there can be no eradication of happiness and sorrow to be sure”. (Ch.VIII.xii.1) Embodied in this case means one who is identified with the body.
Taking the Vedantin role Sankara makes clear that unembodiedness is not, and cannot be, achieved, as a result of good deeds. If you are definitely bodiless, what can this mean? The only sensible conclusion is that the enlightened one does not consider his identity to be personal. There is a physical form with perhaps residual karma that may require spectacles to avoid walking into the furniture but his identity is impersonal. There is no doubt that some students of Advaita find this disembodiedness a sticking point. They take it quite literally and are puzzled by the groans of pain emitted by a jnani when he stubs his toe or suffers from cancer.
Jnana then is not a sort of good luck/fortune thing (sampad). It does not depend on that. It is the direct absorption by reality or the recognition that such was the case all along. “ Brahman is denied to be the object of an act of knowing.”
“By presenting Brahman as not an object on account of its being the inmost Self (of the knower), they remove the differences of the “known”, the “knower”, and the “knowledge” that are fancied through ignorance.”
My own way of getting this is that you cannot get ‘outside’ the self in order to know it. You cannot comprehend it which is why the upanisad says ‘neti’, ‘neti’, not this/not this.
Now comes an important epistemological point:
Opponent: Is not knowledge a kind of mental action?
Actually no. Knowledge is an achievement, a state. Meditation though mental may be done or not as the case may be. Knowledge is the immediate fruit of a valid means of knowledge. Might the application of these means of knowledge be an action? Yes. So knowledge is then a mental condition but not an act. But in the case of ‘jnana’ or self-realisation knowledge is not grasped by the mind and it is beyond what can be described because the Self cannot be comprehended by the Self.
As I read this sutra I realise that it places all the important points of Advaita in juxtaposition. What is its purport, its summum bonum? How is that achieved and can we even speak of an achievement? The answer to that would appear to be yes because knowledge is an achieved condition. Even though knowledge is an achieved condition yet the preparation for that state involves actions which are enjoined in the Upanishads.
The knowledge of Brahman is said to give rise to unembodiedness. What can that mean? Some take it literally but that can’t be right because clearly the sage walks and talks and has a physical presence. This is a state of knowledge in which the identification with the body ceases.
“…the idea of embodiedness is a result of false nescience. Unless it is through the false ignorance of identifying the Self with the body, there can be no embodiedness for the Self. And we said that the unembodiedness of the Self is eternal, since it is not a product of action.”
Karma has ended for the sage but for the rest of us hearing, meditation and contemplation are used to bring on that state of enlightenment. (sravana, manana, nididhyasana)