To me there is neither earth, nor water, nor fire, nor air, nor ether. Thus realizing the nature of the Paramatman - the One who is in the cavity-of-the-heart, who is without-parts, without-a-second, the 'witness' - of-all, beyond both existence and non-existence - the seeker attains the very nature of the Supreme Atman.

~ Kaivalya Upanishad 23-24