Hiriyanna explains Sabda-pramana as a concept which means reliable expert testimony. The schools of Hinduism which consider it epistemically valid suggest that a human being needs to know numerous facts, and with the limited time and energy available, he can learn only a fraction of those facts and truths directly.
Hiriyanna defines Sabda-pramana as a concept that denotes trustworthy expert testimony. The Hindu schools that regard it as epistemically valid suggest that humans need to acquire a vast amount of knowledge, but due to the limitations of time and energy, they can only gain a limited understanding of those facts and truths through direct experience.