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.