Vishnupurana 1.5.p3.5

1.5.p3.5

And from the auditory Veda, he assigned appellations unto the sages,—and appointed them to their respective functions. And as the signs of the seasons successively manifest themselves, the characteristics, of the Yugas are seen in due order. And instinct with energy arising from a desire of creation, He, actuated by the creative impulse, thus again and again bringeth about creation at the commencement of Kalpas".