So one should be inquisitive to know, "How this physical body has come into existence, covering myself, the spiritual body, ahaṁ brahmāsmi?" So to understand this science, Kapiladeva is explaining the physical Sāṅkhya philosophy, how things are developing. To understand that. . . The same thing: to understand the simple thing, that "I am not this body. The body has developed from the soul." Therefore we challenge the material scientists. They say that the soul has developed from the body. No. Soul has not developed from the body, but the body has developed from the soul. Just the opposite. The material scientists, they think that combination of these physical elements creates a situation where is. . . when there is living, life symptoms. No. That is not. The real is that, fact is, that the spirit soul is there. They are wandering all over the universe, brahmāṇḍa brahman. Brahmāṇḍa means all over the universe. The spirit soul is sometimes in one species of life; sometimes he's another species of life. Sometimes he is in this planet, sometimes another planet. In this way, according to his karma he is wandering. That is his material life. So ei rūpe brahmāṇḍa bhramite (CC Madhya 19.151). He is loitering, wandering without any aim. "What is the aim of life? Why I have put into this condition, accepting this material body, the source of all miseries?"—these questions should be asked. This is called brahma-jijñāsā. And that should be answered properly. Then our life will be successful. Otherwise it is as useless as the body of a cat or a dog—no understanding, mūḍha. Mūḍha.
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).