Śrī Āvirhotra replied: Prescribed duties, nonperformance of such duties, and forbidden activities are topics one can properly understand through authorized study of the Vedic literature. This difficult subject matter can never be understood by mundane speculation. The authorized Vedic literature is the sound incarnation of the Personality of Godhead Himself, and thus Vedic knowledge is perfect. Even the greatest learned scholars are bewildered in their attempts to understand the science of action if they neglect the authority of Vedic knowledge.