रसोऽहमप्सु कौन्तेय प्रभास्मि शशिसूर्ययोः।प्रणवः सर्ववेदेषु शब्दः खे पौरुषं नृषु॥
raso ’ham apsu kaunteya prabhāsmi śaśi-sūryayoḥpraṇavaḥ sarva-vedeṣu śabdaḥ khe pauruṣaṃ nṛṣu
Word by word
The verse says
I am the taste in water, Arjuna, and the light in the moon and the sun. I am Om in all the Vedas, sound in space, and the strength in human beings.
In plain words
A list begins here and runs for four verses.
Each item names not a thing but the quality that makes the thing itself. Not water — the taste of water. Not the sun — its light.
He is claiming the inside of ordinary things, not a position above them.
Where you've felt this · in health
You come in from an hour in the sun and drink a glass of cold water. For about three seconds it is the best thing you have ever tasted. Ask what the flavour was and you cannot say, because water does not have one. That was still taste, and at that moment you would not have traded it for anything on the table.
Going deeper
Choosing the taste of water is careful, and it is worth asking why he did not choose the ocean.
Water has no flavour of its own. What it has is a quality you notice only when you need it. The moon's light is not the moon. Praṇava — the syllable Om — is not the hymns; it is the sound they all begin from.
Every item on the list works like this. The plainest, least decorated part of the thing, the part without which it would not be that thing at all.
So the divine is not being placed at the top of the world here. It is being placed at the bottom of every ordinary experience you have. Cold water on a hot afternoon is not a smaller thing than a temple. By this verse it is the same thing, met in a form that needs no preparation at all.