The Philosophy of the Upanishads c7.s2.17

c7.s2.17

Apt and striking also is the remark of a later Upanishad⁴ that no proof of plurality can even be offered, “for no proof is possible of the existence of a duality, and only the timeless âtman admits of proof,” (*i.e.* we are incapable of knowing anything outside of our own consciousness, which under all circumstances forms a unity).