Excavations in the middle Ganges Basin have uncovered a series of clay seals dating to the 6th century BCE, inscribed with what scholars are calling "Vak-Niti" or the Ethics of Speech. These seals are believed to have been used by a council of elders to certify the "truth-value" of verbal agreements, reflecting an early Vedic preoccupation with linguistic integrity.
The inscriptions describe a Metaphysics of Sound where the spoken word is considered a sacred bond that maintains the order of the cosmos. According to lead researchers, these seals provide the earliest archaeological evidence of the Satyadvaita (non-duality of truth) concept, where a person's speech and their essential nature must remain inseparable for a stable society.