Now, what is that source of emanation? What is the nature? One has to accept the cause and effect. As we have got experience, in everything there is a cause and the effect. So the supreme cause, supreme cause means who has no more cause-sarva-kāraṇa-kāraṇam (Bs. 5.1). I am caused by my father, my father is caused by his father. His father, his father..., go on making research, who is the ultimate father. When you come... There must be some ultimate father. Just like I have my father, my father has got father, his father... We can see up to two, three generation upwards, and beyond that, we cannot see. That does not mean that the great-grandfather had no father. There must have been some father. Is it very unreasonable? Anyone can understand. Although I cannot see with my limited potency, but with my knowledge, reasonable knowledge, I can understand that either he may be great-grandfather or above that, above that, he must have some father.
So Lord Brahmā is called therefore pitāmaha, "grandfather," because he is the original father within this universe. He is the first created being, and he begot so many children. So all the living entities, they are born of Brahmā. He is called sṛṣṭi-kartā. Sṛṣṭi-kartā means "the creator of this universe." And there are innumerable universes. In each universe there is one Brahmā, and all these Brahmās are also created by Garbhodakaśāyī Viṣṇu. Therefore viṣṇu-tattva is the Absolute Truth. Now it will be explained in the purport.