In whatever activity you become aware of its presence, that activity lends its appropriate characteristic. In whichever sphere the Sastras discuss and decide, that sphere becomes for the particular Sastras, the characteristic of Brahmam. The Consciousness which becomes apparent when it is limited by certain bounds or vessels - that Chaithanya is Brahmam. The Sun and the sheet of water are unrelated. No relationship can be posited between these two.
Experience alone is the method of approach, the proof, the result.
The ultimate state of Brahma-jnana is the end of all enquiry, all search. Actual Realisation, Sakshathkara is the fruition thereof. This highest stage is reached in Samadhi, the quietening of all agitations in all levels of consciousness, though of course, the preliminary steps of Sravana, Manana and Nididhyasana are concerned with Buddhi or the Intellect. The Jnani recognises in every being and every object the Principle of the all-pervading Atma and when he leaves the world, he becomes free from birth and death. If he is aware of this and if by his efforts, he achieves the Jnana of Brahmam adopting the above- mentioned methods, then verily, his career in this world is worth while.