There is no point in arguing that a materialistic man can be happy. No materialistic creature — be he the great Brahmā or an insignificant ant — can be happy. Everyone tries to make a permanent plan for happiness, but everyone is baffled by the laws of material nature. Therefore the materialistic world is called the darkest region of God’s creation. Yet the unhappy materialists can get out of it simply by desiring to get out. Unfortunately they are so foolish that they do not want to escape. Therefore they are compared to the camel who relishes thorny twigs because he likes the taste of the twigs mixed with blood. He does not realize that it is his own blood and that his tongue is being cut by the thorns. Similarly, to the materialist his own blood is as sweet as honey, and although he is always harassed by his own material creations, he does not wish to escape. Such materialists are called karmīs. Out of hundreds of thousands of karmīs, only a few may feel tired of material engagement and desire to get out of the labyrinth. Such intelligent persons are called jñānīs. The Vedānta-sūtra is directed to such jñānīs. But Śrīla Vyāsadeva, being the incarnation of the Supreme Lord, could foresee the misuse of the Vedānta-sūtra by unscrupulous men, and, therefore, he personally supplemented the Vedānta-sūtra with the Bhāgavata Purāṇa. It is clearly said that this Bhāgavatam is the original commentary on the Brahma-sūtras. Śrīla Vyāsadeva also instructed the Bhāgavatam to his own son, Śrīla Śukadeva Gosvāmī, who was already at the liberated stage of transcendence. Śrīla Śukadeva realized it personally and then explained it. By the mercy of Śrīla Śukadeva, the Bhāgavata-vedānta-sūtra is available for all those sincere souls who want to get out of material existence.