Indra said: In the same manner all the four yugas must be understood. A thousand such cycles of four yugas are said to constitute one day of Brahmā. The night too consists of as many yugas. By the time the yuga comes to a close the living beings lose their straightforward and sentient feelings. This is the characteristic feature of all the yugas. Seventy-one cycles of four yugas constitute a manvantara. What happens in one set of four yugas is repeated in the other cycles of four yugas in the same manner and at the same time as well as in the same order. The differences that occur from creation to creation are limited to twenty-five, neither more nor less. The kalpas too have the same characteristics as the yugas. The same characteristics mark all the manvantaras also.