The human form exists not for animal pursuits but for inquiring into Krishna, the ultimate source of all creation.Listen — Srila Prabhupada Uvaca
Prabhupāda: mahātmānas tu māṃ pārtha daivīṃ prakṛtim āśritāḥ bhajanty ananya-manaso jñātvā bhūtādim avyayam [Bg 9.13] [O son of Pṛthā, those who are not deluded, the great souls, are under the protection of the divine nature. They are fully engaged in devotional service because they know Me as the Supreme Personality of Godhead, original and inexhaustible.] Now, Lord Kṛṣṇa says that who are the mahātmās. The symptom of mahātmā is that he knows that the Supreme Lord, Śrī Kṛṣṇa, is the original Personality of Godhead, and He is the fountainhead and source of all emanation. Janmādy asya yataḥ [SB 1.1.1].
In the Vedānta-sūtra it is said very nicely, athāto brahma jijñāsā: "Now this human form of life is meant for inquiring about Brahman, the greatest." We are all engaged in studying temporary, small things, problems, small problems. What is that problem? Āhāra-nidrā-bhaya-maithuna [Hitopadeśa 25], the animal problems: [Both animals and men share the activities of eating, sleeping, mating and defending. But the special property of the humans is that they are able to engage in spiritual life. Therefore without spiritual life, humans are on the level of animals.] How to eat, how to sleep, how to defend and how to mate.
These four principles, they are very minor problems. They are not at all problems, because automatically these problems are solved. Automatically. Viṣayaḥ khalu sarvataḥ syāt [SB 11.9.29]. [After many, many births and deaths one achieves the rare human form of life, which, although temporary, affords one the opportunity to attain the highest perfection. Thus a sober human being should quickly endeavor for the ultimate perfection of life as long as his body, which is always subject to death, has not fallen down and died. After all, sense gratification is available even in the most abominable species of life, whereas Kṛṣṇa consciousness is possible only for a human being.] Viṣaya means this viṣaya, this object of enjoyment, these bodily necessities. Viṣayaḥ khalu sarvataḥ syāt. Viṣaya—means these objects of sense gratification—you will have in any form of body. Even a small bird, he has arrangement for eating, he has arrangement for sleeping, he has arrangement for defending and he has arrangement for mating.
As soon as a bird is born, two eggs are born: one male, one female. That means from the beginning of his life, the mating problem is solved. There is no necessity. A bird, they never, the birds or beasts, they never seek, the male is seeking after female or female after seeking.
That is automatically solved. Similarly, their eatings are already there, and their sleeping accommodation[?] are already there. So these are not problems, but we have created problems only for these four demands of the body. So Vedānta-sūtra says that "Don't be busy about these problems." Viṣayaḥ khalu sarvataḥ syāt: "These problems are satisfied in any form of life." Why in human form?
They have developed consciousness. They have got better business. Why they should be engaged only for these four principles of life? Huh?
Their problem is to enquire, "What is the source of all these manifestations?" Athāto brahma jijñāsā. The Vedānta-sūtra informs, "Now you should enquire. You have got this developed consciousness of life, human form of life, very intelligent, and you are simply wasting your time simply for this eating, sleeping and mating? Oh, this is not your business. This is not your business." Nāyaṃ deho deha-bhājāṃ nṛloke kaṣṭān kāmān arhate viò-bhujāṃ ye [SB 5.5.1]. [Lord Ṛṣabhadeva told His sons: My dear boys, of all the living entities who have accepted material bodies in this world, one who has been awarded this human form should not work hard day and night simply for sense gratification, which is available even for dogs and hogs that eat stool. One should engage in penance and austerity to attain the divine position of devotional service. By such activity, one's heart is purified, and when one attains this position, he attains eternal, blissful life, which is transcendental to material happiness and which continues forever.] Viò-bhujām means stool-eaters, hogs. So Ṛṣabhadeva says, nāyaṃ deha, this body, is very valuable body. Every living entity has got a body, but this human form of body, especially the civilized form of body, oh, this is very important.