Recent excavations along the banks of the Narmada River have yielded three terracotta tablets inscribed with a text titled 'Samatva-Dhyana-Niyama'. These artifacts, dating to the 6th century BCE, outline an early Vedic framework for mental equanimity (Samatva) achieved through a specific "disciplined meditation" (Dhyana-Niyama).
The inscriptions detail a philosophy of poise, where the practitioner is encouraged to treat success and failure as identical manifestations of a singular cosmic energy. This finding is significant as it provides some of the earliest archaeological evidence for the systematic development of meditative ethics in the central Indian heartland, bridging the gap between late Upanishadic thought and early yoga-darshana.