During this period, power was centralised, along with a growth of near distance trade, standardization of legal procedures, and general spread of literacy. Mahayana Buddhism flourished, but orthodox Brahmana culture began to be rejuvenated by the patronage of the Gupta Dynasty, who were Vaishnavas. The position of the Brahmans was reinforced, the first Hindu temples dedicated to the gods of the Hindu deities, emerged during the late Gupta age. During the Gupta reign the first Puranas were written,hich were used to disseminate "mainstream religious ideology amongst pre-literate and tribal groups undergoing acculturation". The Guptas patronised the newly emerging Puranic religion, seeking legitimacy for their dynasty. The resulting Puranic Hinduism, differed markedly from the earlier Brahmanism of the Dharmasastras and the smritis.

According to P. S. Sharma, "the Gupta and Harsha periods form really, from the strictly intellectual standpoint, the most brilliant epocha in the development of Indian philosophy", as Hindu and Buddhist philosophies flourished side by side. Charvaka, the atheistic materialist school, came to the fore in North India before the 8th century CE.