bibhrat sattvam sva-murtibhih
manv-adibhir idam visvam
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
In each and every change of Manu, the Supreme Personality of Godhead appears by manifesting His internal potency in different incarnations, as Manu and others. Thus He maintains the universe by discovered power.