Shri Shankara Acharya’s Vakyavritti Verse 12
“Abandoning the mind which identifies itself with the body and the other adjuncts, meditate steadfastly with faith on the truth that your own Self is the mind’s witness, of the form of knowledge, and reality and bliss by nature”.
This is the method of meditation by which the Self is realized as reality, bliss and knowledge. It has been remarked that an intellectual conviction of the reality of Self and its identity with the cosmic Self is not of much value unless realized practically in the mental consciousness.
In meditation you do not realize the truth as it is but you negate what it is not, and what remains after the negation of the mind and the body is verily the cosmic consciousness. If the space in the jar is considered in its real form, you will have to negate the roundness which the form of the jar gives to it.What remains when you do this is the cosmic space.
The same applies to the Self.
This meditation is not an intellectual process, because in meditation the truth is made real by contemplation: the intellect itself does not operate.
After steady contemplation for a long, long time in solitude under the discipline of detachment, devotion and faith, the light of the Self shines through and floods the whole mental consciousness. The world is transformed from a set of limitations into pure consciousness which is blissful. Without this realization, Vedanta remains merely talk.