Kena Upanishad

“That which cannot be smelt by the breath, but by which the breath smells an object—That alone know as Brahman and not that which people here worship.”

“That which cannot he heard by the ear, but by which the hearing is perceived—That alone know as Brahman and not that which people here worship.”

“That which cannot be perceived by the eye, but by which the eye is perceived—That alone know as Brahman and not thatwhich people here worship.”

“That which cannot be apprehended by the mind, but by which, they say, the mind is apprehended—That alone know as Brahman and not that which people here worship.”

“That which cannot be expressed by speech, but by which speech is expressed—That alone know as Brahman and not that which people here worship.”