The forgetful living entities or conditioned souls have forgotten their relationship with the Supreme Lord, and they are engrossed in thinking of material activities. Just to transfer their thinking power to the spiritual sky, Kṛṣṇa-dvaipāyana Vyāsa has given a great number of Vedic literatures. First he divided the Vedas into four, then he explained them in the Purāṇas, and for less capable people he wrote the Mahābhārata. In the Mahābhārata there is given the Bhagavad-gītā. Then all Vedic literature is summarized in the Vedānta-sūtra, and for future guidance he gave a natural commentation on the Vedānta-sūtra, called Śrīmad-Bhāgavatam. We must always engage our minds in reading these Vedic literatures.