So the cats' and dogs' life or the cats and dogs in two legs. . . Any human being who has no spiritual knowledge, he is no better than the cats and dogs, but difference is, the cats and dogs have got four legs, and this animal has got two legs, that's all. Dvipāda-paśu. They have been described as dvipāda-paśu. Dvi means two, and pāda means legs. So anyone who has no knowledge of the spiritual existence—how this material body has developed, how we are put into different conditions life—without this knowledge he is two-legged animal, that's all. So don't remain as two-legged animal. You may develop from two-legged animal another body—four-legged animal—but that is not our business. Our business is athāto brahma jijñāsā. That is our life. Now this human form of life should be inquisitive: jijñāsuḥ śreya uttamam. That is life. You must be very much inquisitive to understand what is your ultimate goal of life. Śreya uttamam. Tasmād guruṁ prapadyeta jijñāsuḥ śreya uttamam (SB 11.3.21).
Therefore Bhāgavata says that in order to understand the supreme goal of life, śreya uttamam. . . Śreya means the best. Śreya and preya. Preya means immediately palatable, and śreya means ultimately beneficial. That is called śreya. Just like for a child, playing is priya, preya. He likes to play. But he is by force, by the parents, he is studied books. That is called preya. But because without education his future life will be dark, so parents know it.