nāparaṁ na samaṁ vibho
sad-asat kiñcid anyataḥ
The manifested world is full of varieties of created beings in 8,400,000 species of life, and some of them are superior and inferior to others. In human society the human being is considered to be the superior living being, and amongst the human beings there are also different varieties: good, bad, equal, etc. But Nārada Muni took for granted that none of them has any source of generation besides his father, Brahmājī. Therefore he wanted to know all about them from Lord Brahmā.