71 - 75
71. These twelve thousand (years) which thus have been just mentioned as the total of four (human) ages, are called one age of the gods.
72. But know that the sum of one thousand ages of the gods (makes) one day of Brahman, and that his night has the same length.
73. Those (only, who) know that the holy day of Brahman, indeed, ends after (the completion of) one thousand ages (of the gods) and that his night lasts as long, (are really) men acquainted with (the length of) days and nights.
74. At the end of that day and night he who was asleep, awakes and, after awaking, creates mind, which is both real and unreal.
75. Mind, impelled by (Brahman's) desire to create, performs the work of creation by modifying it self, thence ether is produced; they declare that sound is the quality of the latter.