Our real business is that, "Why we are put into the cycle of birth and death, and according to the body we are suffering different types of miserable condition of life?" Actually, we are trying to enjoy life, sukham, but it is a struggle for existence. Manaḥ ṣaṣṭhāni indriyāṇi prakṛti-sthāni karṣati. We are having great struggle for existence. Therefore we should study philosophically and scientifically, analyze what is this body and what is beyond the body—soul—and what is the soul's function, where is the soul's place; ultimately what is the end goal of the activities of the soul. This is human life. And all this knowledge can be had from the Vedic literature, and the Śrīmad-Bhāgavatam is the essence of Vedic literature. Nigama-kalpa-taror galitaṁ phalam idam (SB 1.1.3).
Vyāsadeva, after writing all the Vedic literature, he was not satisfied. He wrote the four Vedas, then the Purāṇas—Purāṇas means supplementary to the Vedas—and then Vedānta-sūtra, the last word of the Vedic knowledge, Vedānta-sūtra. But he was not satisfied. So Nārada Muni, his spiritual master, he inquired that "Why you are feeling dissatisfaction after writing so many books, giving knowledge to the human society?" So he said: "Sir, yes, I know that I have written . . . but I am not getting satisfaction. I do not know what is the reason." Then Nārada Muni said: "The dissatisfaction is due to your not describing the activities of the Supreme Lord. Therefore you are not satisfied. You have simply discussed the external," I mean to say, "elements, but the internal elements, you have not discussed. Therefore you are dissatisfied. Now you do it."