The Hindu philosphers studied human body and mind in minute detail under various conditions of starvation,privation and restrictions.They fasted, lived in remote hills, in rarified atmospheres and so on.These were their experiements, just as physical scientists do experiments with apparatus and measurements...What did they find?
They found one remarkable correlation...What one finds in the external universe, in phenomenal world of stars and galaxies are to be found within ourselves...At first sight, it is difficult to understand and accept this...I interpret this way...Just as the Universe is complex with distant galaxies ,universes [to recall Stephen Hawking], our body is very intricate with layers of complexities.
Consider this..we have nerve lines going for nearly 150,000 kms according to one encyclopedia.We have trillions of neurons in the brain.Assume each neuron carries a small bit of message or info, how wonderful or complex is the brain...we have billions of cells, some are replaced by new ones, some last a lifetime...As one considers all these, one can surmise that the microcosm is as complex as the macrocosm....
Then, does it mean that the microcosm reflects the structure of the macrocosm? Not in the sense of a physical scientist, but in terms of functions,the Universe is within you...these are matters for reflections and meditation ,not for chopping logic!
In Hinduidm, it is the general doctrine that God or Brahman is not only transcendent, but also immanent in all His creations...The Vedic concept is that the supreme being created the Universe and 'entered into it.'
He is part and parcel of the Universe. He or She or IT is present in every atom of the Universe..In fact He dwells in our body as much as He is in the phenomenal world outside...Therefore it is not correct to say that Brahman is in Heaven, though personal deities or Ishwara can be said to reside in heaven--Vaikuntha or Kailash and so on , as places of Lord or Isvara's abode.
This doctrine is fundamental to Hinduism::God is transcendental--above this perishable, created things,but He is also immanent in the physical Universe...
This doctrine is difficult to understand and live with...there has been tons and tons of interpretations/exegesis on statements regrading this...The very first line Isavasya Upanishad which states:
"Isavasyam Idam Sarvam... "---The Isa or God pervades the universe,or God is clothed in the Universe or similar words --is the basic statement for this doctrine...many acharyas [preceptors]and sects hold slightly different views on this statement and on this issue of "Tanscendence vs Immanence" of Brahman.One can write a separate book on this topic..But the central position that God/Brahman is part and parcel of the phenomenal world cannot be disputed in the Hindu faith.
It may be remarked that in other religions too, the disputes over this doctrine exist and debated over several centuries..In Sufism too, this concept has been disputed and several sects/orders holdly slightly different views.Much schism had developed on this concept alone.
In the final analysis ,however, the position one takes will depend upon one's own tendency towards Jnana marga and Bhakti marga-- the path of enquiry or Advaita and the path of devotion...The devout will emphasize the immanent aspect while the enquirer may pitch upon transcendence of Brahman.....There are of course much variation between the two extremes of upholding either transcendence or immanence alone. What is more, as one advances in spiritual paths, his i position may shift in this spectrum.
What is the relation between Jnana and bhakti?
Bhagavan Ramana replied: The eternal ,unbroken,natural state of abiding in the Self is Jnana. To abide in the Self, you must love the Self.Since God is verily the Self, love of Self is love of God.; and that is Bhakti.Jnana and Bhakti are thus one and the same.
Bhagavan further said: "There is no difference between Jnana and absolute surrender to the Lord,that is,in thought ,word and deed. "