Brihadaranyaka Upanishad 5.14.6

5.14.6

sa ya imām̐strīṃllokān pūrṇānpratigṛhṇīyātso'syā etatprathamaṃ padamāpnuyādatha yāvatīyaṃ trayīvidyā yastāvatpratigṛhṇīyātso'syā etaddvitīyaṃ padamāpnuyādatha yāvadidaṃ prāṇi yastāvatpratigṛhṇīyātso'syā etattṛtīyaṃ padamāpnuyādathāsyā etadeva turīyaṃ darśataṃ padaṃ parorajā ya eṣa tapati naiva kenacanāpyaṃ kuta u etāvatpratigṛhṇīyāt

He who accepts these three worlds replete (with wealth), will be receiving (the results of knowing) only the first foot of the Gāyatrī. He who accepts as much as this treasury of knowledge, the Vedas, (has to confer), will receive (the results of knowing) only its second foot. And he who accepts as much as (is covered by) all living beings, will receive (the results of knowing) only its third foot. While its fourth, apparently visible, supramundane foot—the sun that shines—is not to be counterbalanced by any