MANDUKYA UPANISHAD : Chapter-1. "AGAMA PRAKARANA" ( The Scriptural Treatise ) Mantram-2, Discussion- 10.
( The Scriptural Treatise )
"Sarvam hyetad Brahma, ayam-atma Brahma,
so' yam-atma catuspat."
sarvam - all;
hi - indded;
brahma - this (is) BRAHMAM;
ayam atma brahma - this Self ( ATMA IN US ) is BRAHMAM;
sah - That ( BRAHMAM );
ayam atma - ( which is ) this Self ( ATMA IN US );
catuspat - ( is ) covered with four quarters ( PARTS ).
"All this is verily BRAHMAM. This is BRAHMAM. This JIVATMA ( ATMA WITHIN US ) has four quarters ( parts )."
Electricity as such cannot be explained or perceived and yet, to a raw villager we can explain and convey to him a definite concept of electrical-potency by directing his attention to its various manifestations.
If your son during an evening walk, standing on the beach, asks you, "Papa, what is an Ocean," there no means of explaining it to the child except through the different manifestations of it which the child is actually observing.
The father, will have to say, "The waves, ripples, foam, and lather, which you see now and which lie also beyond your vision around the world, in every seashore are all in the ocean.
In the ocean it is not all waves and disturbances, storms and dangers, but these are only on the surface and leagues beneath it, there is a serene quietude where not even the sun light penetrates, no storms ever reach to disturb!
And still deeper lie the treasures of the ocean, the rich pearls etc."
The father will have to point out all these manifestations of the ocean to the child and explain the ocean as that which is substratum for all these and at once even the entire agitated surface.
To be continued ...