To demonstrate just how 'temporary' the highest material realm is, Krishna gives the mind-bending mathematics of cosmic time. He explains: Those people who truly understand the scale of day and night (te 'ho-rātra-vido janāḥ) know (viduḥ) that a single day of Brahma, the cosmic architect (ahar yad brahmaṇo), lasts for an astonishing duration of one thousand Yugas or ages (sahasra-yuga-paryantam). And his single night (rātriṃ) similarly ends only after a duration of another one thousand ages (yuga-sahasrāntāṃ).